bugzilla-data-medium.json

{"bugs":[{"creation_time":"2020-04-02T00:26:08Z","status":"ASSIGNED","id":1626816,"op_sys":"All","last_change_time":"2025-10-06T13:53:06Z","priority":"P3","component":"Graphics: WebRender","keywords":["perf:responsiveness"],"severity":"S3","summary":"WebRender program cache / shader initialization blocks the main thread via the sync IPC message PWebRenderBridge::EnsureConnected (25ms-40ms startup penalty)"},{"creation_time":"2024-10-01T18:43:40Z","id":1922073,"op_sys":"Android","last_change_time":"2025-01-06T15:03:33Z","status":"ASSIGNED","priority":"P3","component":"JavaScript Engine: JIT","keywords":[],"severity":"S3","summary":"js::jit::GenerateCode spends a lot of time in malloc lock contention"},{"id":216418,"op_sys":"All","last_change_time":"2023-05-15T19:04:00Z","status":"NEW","priority":"--","component":"Layout","keywords":["perf"],"summary":"Page with lots of <pre> text (or rather: extremely deeply-nested inline tags, with lots of linebreaks) uses lots of memory in layout arenas and is slow to load","severity":"S3","creation_time":"2003-08-17T03:26:28Z"},{"status":"NEW","last_change_time":"2024-09-04T13:05:12Z","op_sys":"All","id":304683,"severity":"S3","summary":"firefox struggles with large doxygen html file in nsLocalFile::GetLastModifiedTime (from imgLoader)","component":"Graphics: ImageLib","keywords":["perf:pageload","perf:resource-use","perf:responsiveness","reproducible"],"priority":"--","creation_time":"2005-08-15T08:01:49Z"},{"summary":"Write a new off-the-main-thread IO driver for expat","severity":"S3","component":"XML","priority":"--","keywords":["perf:pageload"],"op_sys":"All","last_change_time":"2023-08-23T01:33:13Z","id":651049,"status":"NEW","creation_time":"2011-04-19T08:20:35Z"},{"status":"NEW","op_sys":"All","last_change_time":"2025-02-09T16:16:28Z","id":1027106,"summary":"Make ImageLib share cached imgRequests for the same SVG document even if the URI has a different ref/hash","severity":"S3","component":"Graphics: ImageLib","priority":"--","keywords":["perf:pageload","perf:resource-use","reproducible","testcase-wanted"],"creation_time":"2014-06-18T15:22:41Z"},{"op_sys":"All","last_change_time":"2024-06-04T18:21:25Z","id":1037984,"status":"NEW","summary":"Website causes Firefox to completely hang because same script file is getting loaded over and over again","severity":"S3","component":"New Tab Page","priority":"P2","keywords":["csectype-dos","hang","memory-leak","perf:responsiveness","reproducible","testcase"],"creation_time":"2014-07-13T16:33:17Z"},{"severity":"S4","summary":"Evaluate aggregating timers to reduce the number of times we wake up the CPU for serving them","priority":"P5","component":"DOM: Core & HTML","keywords":["perf:resource-use"],"status":"NEW","last_change_time":"2025-03-27T16:27:51Z","op_sys":"All","id":1107626,"creation_time":"2014-12-04T20:16:51Z"},{"creation_time":"2015-05-07T20:09:26Z","id":1162698,"op_sys":"All","last_change_time":"2023-07-24T12:16:09Z","status":"NEW","component":"New Tab Page","priority":"P3","keywords":["memory-footprint","memory-leak","perf","perf:responsiveness","top-memory-leak"],"severity":"--","summary":"Thumbnail generation should have a time limit"},{"creation_time":"2016-09-21T13:54:15Z","op_sys":"All","last_change_time":"2025-12-04T06:38:11Z","id":1304389,"status":"NEW","severity":"S3","summary":"Session Restore generates sustained large disk traffic [meta]","priority":"--","keywords":["meta","perf:animation","perf:resource-use","perf:responsiveness","reproducible"],"component":"Session Restore"},{"priority":"P3","keywords":["perf","perf:pageload"],"component":"Layout","summary":"Consider using FramePropertyTable less in layout","severity":"S3","id":1348469,"last_change_time":"2022-10-11T19:06:39Z","op_sys":"Unspecified","status":"NEW","creation_time":"2017-03-18T03:14:39Z"},{"status":"NEW","last_change_time":"2022-10-11T19:07:40Z","op_sys":"macOS","id":1349809,"summary":"getElevationRequired janks the parent process by doing IO on the main thread","severity":"S3","component":"Application Update","priority":"P3","keywords":["perf","perf:responsiveness"],"creation_time":"2017-03-23T02:16:50Z"},{"severity":"S3","summary":"Showing the bookmarks panel is too slow the first time","priority":"P3","component":"Bookmarks & History","keywords":["perf:responsiveness"],"status":"NEW","last_change_time":"2024-04-03T13:53:20Z","op_sys":"Unspecified","id":1363131,"creation_time":"2017-05-08T18:35:31Z"},{"creation_time":"2017-05-10T02:24:10Z","keywords":["meta","perf","perf:responsiveness","perf:startup"],"component":"XPCOM","priority":"--","summary":"[meta] Creating the XPCOM system info service shouldn't be expensive","severity":"S3","status":"NEW","id":1363586,"last_change_time":"2025-03-24T22:09:33Z","op_sys":"Unspecified"},{"summary":"Defer mozilla::widget::AudioSession::Start() until later in startup","severity":"S3","priority":"P3","component":"Widget: Win32","keywords":["perf","perf:responsiveness","perf:startup"],"status":"NEW","last_change_time":"2022-10-11T19:17:24Z","op_sys":"Unspecified","id":1364091,"creation_time":"2017-05-11T14:44:03Z"},{"creation_time":"2017-06-06T12:51:51Z","component":"Security: PSM","priority":"P2","keywords":["perf:responsiveness","perf:startup"],"summary":"NSS should be initialized off main thread","severity":"S3","status":"NEW","id":1370516,"op_sys":"Unspecified","last_change_time":"2023-12-11T13:17:23Z"},{"creation_time":"2017-06-19T08:52:46Z","id":1374216,"op_sys":"Unspecified","last_change_time":"2022-10-11T19:24:38Z","status":"NEW","component":"Toolbars and Customization","keywords":["perf:frontend","perf:startup","regression","regressionwindow-wanted"],"priority":"P3","severity":"S3","summary":"Add-on icons should be in the navbar by first paint"},{"creation_time":"2017-08-08T21:56:17Z","status":"NEW","id":1388538,"op_sys":"Unspecified","last_change_time":"2024-12-06T16:27:49Z","keywords":[],"priority":"P3","component":"JavaScript Engine","summary":"Add ICs for slotful own-prop Xray property access (property on the expando)","severity":"S3"},{"creation_time":"2017-09-18T08:13:45Z","op_sys":"macOS","last_change_time":"2022-10-11T19:42:53Z","id":1400787,"status":"NEW","severity":"S3","summary":"Using software video decoders (include VP9) ramps up computer fans on Macbook.","component":"Audio/Video: Playback","keywords":["perf:resource-use"],"priority":"P3"},{"creation_time":"2017-10-07T10:11:51Z","priority":"P2","keywords":["perf:responsiveness"],"component":"CSS Parsing and Computation","severity":"S3","summary":"stylo: use invalidation framework to handle restyles needed in response to content insertion/removal","id":1406622,"last_change_time":"2022-10-11T19:47:36Z","op_sys":"Unspecified","status":"NEW"},{"keywords":["perf","perf:frontend"],"priority":"P3","component":"Tabbed Browser","summary":"With tab animations disabled, closing current tab to switch to another will visibly show a blank page with spinner (causing flashing)","severity":"S3","id":1425887,"op_sys":"All","last_change_time":"2025-11-24T20:54:46Z","status":"NEW","creation_time":"2017-12-18T17:47:35Z"},{"op_sys":"Unspecified","last_change_time":"2025-06-11T11:06:28Z","id":1428972,"status":"NEW","summary":"RexBench is slower than Chrome/WebKit","severity":"S3","component":"JavaScript Engine","priority":"P2","keywords":["perf"],"creation_time":"2018-01-09T05:47:13Z"},{"component":"New Tab Page","priority":"P3","keywords":["perf:frontend","perf:startup"],"severity":"S3","summary":"Activity stream initialization causes jank after receiving the sessionstore-windows-restored notification","status":"NEW","id":1439892,"last_change_time":"2024-04-03T03:06:41Z","op_sys":"Unspecified","creation_time":"2018-02-21T13:15:04Z"},{"priority":"P3","keywords":["perf","perf:responsiveness"],"component":"CSS Parsing and Computation","severity":"S3","summary":"Try to understand why we're slower than Chrome on StyleBench \"Positional pseudo classes : Adding leaf elements: Async\" (& similar \"Removing\" measurement)","id":1443066,"op_sys":"Unspecified","last_change_time":"2022-10-11T21:21:11Z","status":"NEW","creation_time":"2018-03-05T04:29:30Z"},{"creation_time":"2018-03-15T16:29:05Z","id":1446012,"op_sys":"Unspecified","last_change_time":"2022-10-11T21:23:37Z","status":"NEW","component":"Application Update","priority":"P3","keywords":["perf:startup"],"severity":"S3","summary":"The first startup after an update does main thread I/O to update.status several times"},{"creation_time":"2018-04-17T08:42:34Z","priority":"P5","component":"JavaScript Engine: JIT","keywords":["perf"],"summary":"Optimize resume point creation in IonBuilder","severity":"N/A","status":"NEW","id":1454586,"op_sys":"All","last_change_time":"2025-04-23T10:03:41Z"},{"creation_time":"2018-04-24T20:33:58Z","status":"NEW","id":1456626,"op_sys":"Unspecified","last_change_time":"2025-04-15T20:34:51Z","component":"Networking: JAR","keywords":["perf","perf:responsiveness","perf:startup"],"priority":"P3","summary":"nsJARChannel::asyncOpen can still block","severity":"S3"},{"summary":"Checkerboarding while scrollbar-dragging due to slow display list build on specific page with table layout","severity":"S3","keywords":["nightly-community","perf","perf:responsiveness","regression"],"component":"Web Painting","priority":"P3","op_sys":"Windows 7","last_change_time":"2025-03-11T07:19:40Z","id":1456638,"status":"NEW","creation_time":"2018-04-24T21:08:43Z"},{"severity":"S3","summary":"It takes a long time to re-layout the plaintext page when the sidebar is opening or closing until  move the mouse in the content area (with long time spent in RFindLineContaining)","component":"Layout: Block and Inline","priority":"P3","keywords":["perf","perf:responsiveness"],"status":"NEW","last_change_time":"2024-02-08T23:49:09Z","op_sys":"Windows 10","id":1456964,"creation_time":"2018-04-25T19:10:14Z"},{"severity":"S3","summary":"TabChild::RecvRenderLayers often results in two consecutive paints","keywords":["perf:resource-use"],"component":"DOM: Content Processes","priority":"P2","last_change_time":"2023-09-21T15:50:42Z","op_sys":"Unspecified","id":1457276,"status":"NEW","creation_time":"2018-04-26T19:55:49Z"},{"id":1458634,"op_sys":"Unspecified","last_change_time":"2023-05-22T15:45:39Z","status":"NEW","priority":"P3","keywords":["perf","perf:resource-use","perf:responsiveness"],"component":"Bookmarks & History","severity":"S3","summary":"\"forget about this site\" in \"show all history\" blocks the main thread","creation_time":"2018-05-02T18:01:37Z"},{"status":"NEW","id":1468246,"last_change_time":"2022-10-11T21:41:13Z","op_sys":"Unspecified","component":"Layout","priority":"P3","keywords":["perf:pageload"],"summary":"High variability in performance testing with large images","severity":"S3","creation_time":"2018-06-11T20:32:18Z"},{"creation_time":"2018-06-25T21:14:25Z","op_sys":"All","last_change_time":"2022-10-11T21:43:40Z","id":1471029,"status":"NEW","summary":"High cpu/gpu usage and hangs on page-http://telegra.ph/Telegram-X-03-26 & other pages","severity":"S3","priority":"P3","component":"Audio/Video: Playback","keywords":["hang","perf:resource-use","power"]},{"summary":"Optimize Windows sandbox policy construction","severity":"S3","component":"Security: Process Sandboxing","priority":"P2","keywords":["perf:responsiveness","perf:startup"],"status":"NEW","op_sys":"Windows","last_change_time":"2022-10-11T21:47:20Z","id":1476101,"creation_time":"2018-07-16T20:44:07Z"},{"creation_time":"2018-07-27T10:44:44Z","priority":"P3","component":"CSS Parsing and Computation","keywords":["perf:responsiveness"],"summary":"style.foo = bar changes are slow","severity":"S3","status":"NEW","id":1478953,"last_change_time":"2022-10-11T21:49:50Z","op_sys":"Unspecified"},{"creation_time":"2018-08-08T22:40:31Z","last_change_time":"2025-03-06T17:21:40Z","op_sys":"All","id":1481967,"status":"NEW","summary":"100% cpu usage and high memory use on page with multiple embedded videos","severity":"S3","keywords":["perf:resource-use"],"priority":"P3","component":"Audio/Video: Playback"},{"summary":"Try and re-attach NewObject stubs after GC","severity":"S3","component":"JavaScript Engine: JIT","priority":"P3","keywords":[],"status":"NEW","last_change_time":"2024-09-21T13:28:21Z","op_sys":"Unspecified","id":1483345,"creation_time":"2018-08-14T19:58:58Z"},{"status":"NEW","last_change_time":"2025-01-29T17:31:27Z","op_sys":"macOS","id":1488435,"summary":"Significant key input delay when typing on large Google Docs","severity":"S3","keywords":[],"component":"JavaScript Engine","priority":"P3","creation_time":"2018-09-04T14:10:08Z"},{"creation_time":"2018-09-12T22:40:00Z","priority":"P5","component":"JavaScript Engine: JIT","keywords":["meta"],"severity":"N/A","summary":"[meta] Long-standing Ion Compilation Time Issues","status":"NEW","id":1490847,"last_change_time":"2025-04-23T10:05:12Z","op_sys":"Unspecified"},{"creation_time":"2018-09-12T22:46:57Z","id":1490849,"last_change_time":"2025-11-20T08:28:19Z","op_sys":"Unspecified","status":"NEW","component":"JavaScript Engine: JIT","priority":"P2","keywords":[],"severity":"N/A","summary":"Off-Main-Thread Baseline Compilation"},{"creation_time":"2018-10-03T15:02:45Z","status":"NEW","op_sys":"Unspecified","last_change_time":"2025-03-06T17:21:31Z","id":1496096,"severity":"S3","summary":"Horrible performance on runningworld due to media decoding","priority":"P3","component":"Audio/Video: Playback","keywords":["perf:resource-use"]},{"creation_time":"2018-10-12T07:38:21Z","id":1498485,"op_sys":"Android","last_change_time":"2024-05-03T15:18:39Z","status":"NEW","priority":"P3","component":"JavaScript Engine","keywords":["perf:responsiveness"],"severity":"S3","summary":"hubs.mozilla.com frame rate with an empty scene is too slow in FxR on Oculus Go"},{"priority":"--","component":"CSS Parsing and Computation","keywords":["perf:animation","regression","reproducible","top50"],"severity":"S3","summary":"Reddit content is no longer displayed when scrolled (checkerboarding), with long restyles","status":"NEW","id":1502334,"op_sys":"All","last_change_time":"2025-03-11T08:54:07Z","creation_time":"2018-10-26T12:54:03Z"},{"creation_time":"2018-11-06T22:12:10Z","summary":"twitch.tv site loads slow compared to Chrome","severity":"S3","component":"JavaScript Engine","priority":"P2","keywords":["perf:pageload"],"op_sys":"Android","last_change_time":"2022-10-11T22:10:59Z","id":1505192,"status":"NEW"},{"creation_time":"2018-11-07T17:49:31Z","op_sys":"Unspecified","last_change_time":"2025-03-06T17:04:43Z","id":1505483,"status":"NEW","summary":"Getting a list of audio devices on about:support is super slow sometimes","severity":"S3","priority":"P3","keywords":["perf:responsiveness"],"component":"Audio/Video"},{"creation_time":"2018-11-07T19:32:59Z","id":1505533,"last_change_time":"2024-03-20T20:46:07Z","op_sys":"Unspecified","status":"NEW","keywords":["main-thread-io","perf:responsiveness"],"priority":"P5","component":"Graphics","severity":"S3","summary":"graphics data gathering (and/or canvas webgl context initialization) from about:support is slow"},{"creation_time":"2018-11-13T04:54:48Z","id":1506765,"last_change_time":"2022-10-11T22:12:27Z","op_sys":"Unspecified","status":"NEW","component":"DOM: Animation","keywords":["perf:responsiveness"],"priority":"P3","severity":"S3","summary":"Do an optimization to not flush animations which are running on the compositor in various places where we call FlushPendingNotification"},{"creation_time":"2018-11-13T21:07:29Z","keywords":["perf:frontend","perf:responsiveness","perf:startup"],"component":"Tabbed Browser","priority":"P5","summary":"Try persisting chromemargin and brighttext attributes on browser windows","severity":"S3","status":"NEW","id":1506962,"last_change_time":"2022-10-11T22:12:38Z","op_sys":"Unspecified"},{"severity":"S3","summary":"Firefox is very slow to render poster PDF","priority":"P3","component":"PDF Viewer","keywords":["parity-chrome","perf","perf:animation","perf:pageload","perf:responsiveness","regression","reproducible"],"status":"NEW","op_sys":"Unspecified","last_change_time":"2023-07-24T12:22:05Z","id":1508765,"creation_time":"2018-11-20T19:36:06Z"},{"creation_time":"2018-11-22T04:38:51Z","component":"DOM: Core & HTML","priority":"P3","keywords":["perf","perf:pageload"],"severity":"S3","summary":"Optimizing nsGlobalWindowOuter::NotifyContentBlockingState() seems to have an impact on pageload","status":"NEW","id":1509228,"op_sys":"Unspecified","last_change_time":"2022-10-11T22:14:24Z"},{"creation_time":"2018-12-19T19:35:51Z","component":"JavaScript: GC","priority":"P3","keywords":["perf","perf:pageload"],"severity":"S3","summary":"Defer GCs in background tabs/processes during pageload","status":"NEW","id":1515414,"op_sys":"Unspecified","last_change_time":"2022-10-11T22:19:55Z"},{"creation_time":"2018-12-19T22:43:20Z","status":"NEW","id":1515473,"op_sys":"Unspecified","last_change_time":"2024-08-03T20:54:28Z","keywords":["perf","perf:responsiveness"],"component":"Graphics","priority":"P3","severity":"S3","summary":"CPU intensive slideshow on http://thesantaclausparade.com/"},{"creation_time":"2018-12-20T23:13:35Z","component":"General","priority":"P3","keywords":["meta","perf:frontend","perf:startup"],"summary":"[meta] reduce impact/overhead of custom element use on startup","severity":"S3","status":"NEW","id":1515799,"op_sys":"Unspecified","last_change_time":"2023-08-05T01:39:19Z"},{"creation_time":"2018-12-27T14:05:19Z","keywords":["perf:frontend","perf:startup"],"priority":"P5","component":"Downloads Panel","severity":"S3","summary":"Download indicator code should use idle task and/or not load until there are downloads","status":"NEW","id":1516525,"op_sys":"Unspecified","last_change_time":"2022-10-11T22:20:48Z"},{"last_change_time":"2022-10-11T22:24:11Z","op_sys":"Unspecified","id":1520729,"status":"NEW","summary":"jetbrains \"upsource\" file-view hangs the browser, when scrolled","severity":"S3","keywords":["perf:responsiveness"],"component":"Layout","priority":"P2","creation_time":"2019-01-17T08:50:51Z"},{"creation_time":"2019-01-23T18:40:07Z","keywords":["perf:pageload"],"priority":"P2","component":"Layout: Text and Fonts","severity":"S3","summary":"InitOtherFamilyNamesRunnable can slow down first page load and take > 100ms","status":"NEW","id":1522196,"last_change_time":"2022-10-11T22:25:37Z","op_sys":"All"},{"creation_time":"2019-01-26T00:23:18Z","id":1523028,"last_change_time":"2025-03-02T13:58:32Z","op_sys":"All","status":"NEW","component":"Preferences","priority":"P3","keywords":["meta","perf","perf:responsiveness","regression"],"summary":"[meta] Performance of \"about:config\"","severity":"S3"},{"status":"NEW","id":1524384,"last_change_time":"2025-03-17T17:28:58Z","op_sys":"macOS","priority":"P3","component":"Audio/Video: Playback","keywords":["perf:responsiveness"],"severity":"S3","summary":"Twitch.tv video's (vod) freeze during playback on MacOS","creation_time":"2019-01-31T20:58:54Z"},{"op_sys":"Unspecified","last_change_time":"2022-10-11T22:29:04Z","id":1527037,"status":"NEW","summary":"Scroll jank when mousewheel-scrolling slide thumbnails on Google Docs (with lots of time spent painting & in GetFrameForPoint)","severity":"S3","keywords":["perf:responsiveness"],"priority":"P2","component":"Web Painting","creation_time":"2019-02-11T18:16:31Z"},{"creation_time":"2019-02-15T16:08:16Z","status":"NEW","op_sys":"Unspecified","last_change_time":"2025-11-21T13:11:58Z","id":1528285,"summary":"[meta] Allow call of AsyncOpen and OnStart/OnStopRequest off the main thread","severity":"S3","component":"Networking: HTTP","keywords":["meta","perf:pageload"],"priority":"P2"},{"creation_time":"2019-03-11T18:25:07Z","status":"NEW","last_change_time":"2023-08-05T01:38:55Z","op_sys":"Unspecified","id":1534371,"severity":"S3","summary":"Lazy load browser.xul menus","keywords":["perf:frontend","perf:startup"],"priority":"P3","component":"Menus"},{"creation_time":"2019-03-19T21:20:53Z","keywords":["perf","perf:resource-use"],"priority":"P3","component":"Graphics","severity":"S3","summary":"[10.14.4] Poor battery life on MacBook Pro","id":1536622,"last_change_time":"2023-02-01T17:22:05Z","op_sys":"macOS","status":"NEW"},{"priority":"P3","component":"General","keywords":["perf:responsiveness"],"summary":"Performance is slow/janky with a full complement of add-ons, restored session, opening discarded tabs","severity":"S3","id":1536739,"last_change_time":"2024-04-02T13:41:19Z","op_sys":"Unspecified","status":"NEW","creation_time":"2019-03-20T07:53:47Z"},{"creation_time":"2019-03-25T17:26:55Z","keywords":["perf:resource-use"],"priority":"--","component":"XPCOM","severity":"S3","summary":"Set nsThreadPool limits more intelligently","status":"NEW","id":1538784,"last_change_time":"2025-03-20T13:08:13Z","op_sys":"Unspecified"},{"creation_time":"2019-03-26T20:57:57Z","id":1539266,"op_sys":"Unspecified","last_change_time":"2022-10-11T22:39:22Z","status":"NEW","component":"Graphics","priority":"P3","keywords":["perf:responsiveness"],"severity":"S3","summary":"Running gfxPlatform::Init in the content process can take a long time"},{"severity":"S3","summary":"Brief video and audio interruptions on YouTube when tab is focused after it was in the background","component":"Graphics","priority":"P2","keywords":["perf:responsiveness"],"status":"NEW","last_change_time":"2022-10-11T22:40:24Z","op_sys":"Unspecified","id":1540226,"creation_time":"2019-03-29T19:18:26Z"},{"creation_time":"2019-04-02T20:18:11Z","status":"NEW","id":1541200,"last_change_time":"2025-08-26T15:54:44Z","op_sys":"Unspecified","priority":"P2","component":"Crash Reporting","keywords":["main-thread-io","perf:startup"],"summary":"Avoid nsExceptionHandler::SetupExtraData() doing main thread IO super early on startup","severity":"S3"},{"creation_time":"2019-04-03T17:10:18Z","status":"NEW","id":1541491,"op_sys":"Unspecified","last_change_time":"2024-07-25T20:36:55Z","priority":"P3","keywords":["main-thread-io","perf","perf:startup"],"component":"Startup and Profile System","summary":"Evaluate whether we can stop using compatibility.ini in the common case where app compat info is in profiles.ini / installs.ini","severity":"S3"},{"creation_time":"2019-04-03T17:15:49Z","last_change_time":"2022-10-11T22:41:40Z","op_sys":"Unspecified","id":1541494,"status":"NEW","severity":"S3","summary":"Stop writing compatibility.ini piecemeal and on the main thread and on startup","priority":"P3","keywords":["main-thread-io","perf","perf:responsiveness","perf:startup"],"component":"Startup and Profile System"},{"id":1541601,"last_change_time":"2025-09-30T14:55:10Z","op_sys":"Unspecified","status":"NEW","component":"Startup and Profile System","priority":"--","keywords":["main-thread-io","perf","perf:startup"],"summary":"Very very very carefully... remove channel-prefs.js and stop reading it from the main thread early on startup","severity":"S3","creation_time":"2019-04-03T21:31:57Z"},{"creation_time":"2019-04-11T17:55:48Z","status":"NEW","last_change_time":"2025-03-21T02:42:28Z","op_sys":"Unspecified","id":1543776,"severity":"S3","summary":"[meta] 5+ second delays seen while loading www.allrecipes.com on geckoview_example","component":"Performance: Navigation","keywords":["meta","perf:pageload"],"priority":"P2"},{"creation_time":"2019-04-12T14:40:08Z","id":1544019,"op_sys":"Unspecified","last_change_time":"2023-05-31T19:21:00Z","status":"NEW","component":"XPCOM","priority":"--","keywords":["main-thread-io","perf","perf:startup"],"severity":"S3","summary":"Consolidate IO for startupCache folder access"},{"op_sys":"Unspecified","last_change_time":"2022-10-11T22:44:28Z","id":1544504,"status":"NEW","severity":"S3","summary":"Investigate compressing omni.ja's (with lz4)","component":"Startup and Profile System","priority":"P3","keywords":["main-thread-io","perf","perf:responsiveness","perf:startup"],"creation_time":"2019-04-15T18:19:33Z"},{"status":"NEW","id":1545119,"last_change_time":"2023-06-26T23:49:36Z","op_sys":"Unspecified","priority":"P5","component":"Application Update","keywords":["main-thread-io","perf:startup"],"severity":"S3","summary":"Update service tries to migrate things from \"old update dir\" early on startup and does main thread IO","creation_time":"2019-04-17T15:06:25Z"},{"summary":"Only prefetch the parts of XUL.dll  that we actually will need","severity":"S3","component":"Startup and Profile System","keywords":["main-thread-io","perf","perf:startup"],"priority":"P3","op_sys":"Unspecified","last_change_time":"2022-10-11T22:47:35Z","id":1548033,"status":"NEW","creation_time":"2019-04-30T16:38:33Z"},{"creation_time":"2019-05-02T14:17:10Z","status":"NEW","op_sys":"Unspecified","last_change_time":"2025-03-03T21:20:28Z","id":1548539,"summary":"Stopping blocking 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information from the original","severity":"S3","status":"NEW","id":1554200,"last_change_time":"2023-02-22T18:35:16Z","op_sys":"Unspecified","creation_time":"2019-05-24T15:01:19Z"},{"creation_time":"2019-05-24T20:22:15Z","summary":"Classifier Update should wait for an user-idle period before initiating an update","severity":"S3","component":"Safe Browsing","keywords":["perf:pageload","perf:responsiveness"],"priority":"P3","op_sys":"Unspecified","last_change_time":"2025-02-12T03:06:45Z","id":1554313,"status":"NEW"},{"creation_time":"2019-06-06T15:49:16Z","component":"Security: PSM","keywords":["main-thread-io","perf","perf:startup"],"priority":"P3","summary":"Investigate linking softokn/freebl/nss thingies directly into libxul or use readahead to make actual nss initialization cheaper","severity":"S3","status":"NEW","id":1557378,"op_sys":"Unspecified","last_change_time":"2025-12-16T16:09:55Z"},{"creation_time":"2019-07-16T15:55:54Z","status":"NEW","last_change_time":"2024-04-03T16:04:02Z","op_sys":"All","id":1566487,"summary":"When defaulting to showing about:home on startup, try to delay WebExtension process start-up until after about:home is done loading","severity":"S3","component":"General","priority":"P3","keywords":["perf:resource-use","perf:startup"]},{"creation_time":"2019-07-22T20:30:43Z","status":"NEW","id":1568027,"op_sys":"Unspecified","last_change_time":"2024-09-20T22:54:50Z","priority":"P3","keywords":["perf:responsiveness"],"component":"Graphics: WebRender","summary":"WebRender performs worse on Binding of Isaac CodePen demo (svg filters/blob)","severity":"S3"},{"creation_time":"2019-07-30T18:44:15Z","status":"NEW","last_change_time":"2025-03-21T02:42:54Z","op_sys":"Unspecified","id":1570090,"severity":"S3","summary":"Investigate fast first 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Navigation","priority":"P3","summary":"Implement caching of retired web-isolated processes for reuse in the same domain in Fission","severity":"S3"},{"last_change_time":"2022-10-11T23:50:49Z","op_sys":"Unspecified","id":1609444,"status":"NEW","summary":"GMP thread can write to disk (to clear storage or remove plugins) at xpcom-shutdown-threads time","severity":"S3","component":"Audio/Video: GMP","priority":"P3","keywords":["perf:responsiveness"],"creation_time":"2020-01-15T15:49:54Z"},{"status":"NEW","op_sys":"All","last_change_time":"2024-06-28T12:13:45Z","id":1613760,"summary":"[fission-power] Synchronize periodic background tasks (such as expiration tracker ticks) across content processes","severity":"S3","component":"Performance: General","keywords":["perf:resource-use"],"priority":"P2","creation_time":"2020-02-06T20:58:06Z"},{"status":"NEW","id":1613824,"last_change_time":"2025-03-21T02:41:36Z","op_sys":"Android","component":"Performance: 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Responsiveness","keywords":["perf:responsiveness"],"creation_time":"2020-06-17T17:48:18Z"},{"keywords":["perf:pageload"],"component":"Performance: Navigation","priority":"P3","summary":"Firefox takes 50% more time than Chrome to load/reload pages on Boardgamegeek","severity":"S3","id":1650708,"last_change_time":"2025-04-21T16:54:21Z","op_sys":"Unspecified","status":"NEW","creation_time":"2020-07-06T04:12:46Z"},{"priority":"P3","component":"General","keywords":["perf:frontend","perf:startup"],"summary":"Evaluate what things should move out of _scheduleArbitrarilyLateIdleTasks()","severity":"N/A","status":"NEW","id":1651161,"last_change_time":"2022-03-28T19:22:23Z","op_sys":"Unspecified","creation_time":"2020-07-07T18:32:36Z"},{"op_sys":"Unspecified","last_change_time":"2024-11-19T15:27:45Z","id":1653088,"status":"NEW","summary":"Performance issue on voice.google.com - Site can hang from seconds to minutes","severity":"S4","component":"JavaScript: GC","priority":"P3","keywords":["perf:responsiveness"],"creation_time":"2020-07-15T20:19:35Z"},{"creation_time":"2020-07-18T16:39:27Z","severity":"S3","summary":"WebGL aquarium sample runs at 30 FPS on Google Pixel 2, 60 FPS on WebView/Chromium","component":"Graphics: CanvasWebGL","priority":"P2","keywords":["perf:responsiveness"],"op_sys":"Android","last_change_time":"2025-06-25T23:56:23Z","id":1653777,"status":"NEW"},{"creation_time":"2020-07-18T17:04:31Z","component":"Debugger","priority":"P3","keywords":["leave-open","perf:responsiveness"],"severity":"S3","summary":"Firefox freezes and becomes unusable on react/typescript/eval-source-map project","id":1653779,"last_change_time":"2025-11-03T12:19:39Z","op_sys":"Unspecified","status":"NEW"},{"id":1656709,"last_change_time":"2022-03-02T16:39:47Z","op_sys":"Unspecified","status":"NEW","component":"Graphics: Canvas2D","priority":"P3","keywords":["perf:responsiveness"],"summary":"some games at gamee.com stutter a lot on firefox while 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10.15.7","severity":"S4","id":1670193,"op_sys":"Unspecified","last_change_time":"2024-07-17T17:29:49Z","status":"NEW","creation_time":"2020-10-09T09:09:08Z"},{"creation_time":"2020-10-19T01:37:21Z","summary":"Not responding notification from Firefox (in titlebar) when switching to a background window","severity":"S3","keywords":["perf:responsiveness"],"priority":"P3","component":"Graphics","op_sys":"Windows 10","last_change_time":"2022-10-25T15:51:21Z","id":1671859,"status":"NEW"},{"priority":"P2","keywords":["nightly-community","perf:responsiveness"],"component":"Performance: Responsiveness","summary":"Checkerboarding on scrolling wired.com article","severity":"S3","id":1675628,"last_change_time":"2025-04-24T20:32:00Z","op_sys":"Unspecified","status":"NEW","creation_time":"2020-11-05T22:19:58Z"},{"severity":"S3","summary":"nsCocoaWindow::GetWorkspaceID() hangs in SLSCopySpacesForWindows from SkyLight","component":"Widget: 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thread hangs in SendFlushRendering if WebRender is busy","severity":"S3","keywords":[],"priority":"--","component":"Graphics: WebRender","creation_time":"2021-01-26T19:38:43Z"},{"status":"NEW","id":1688963,"op_sys":"All","last_change_time":"2026-02-13T14:26:41Z","component":"Graphics: WebRender","keywords":["perf:startup"],"priority":"--","severity":"S3","summary":"WebRender initialization can block the main thread for an appreciable amount of time","creation_time":"2021-01-26T19:43:22Z"},{"status":"NEW","id":1689225,"op_sys":"Unspecified","last_change_time":"2025-03-11T08:48:39Z","keywords":["perf","perf:responsiveness"],"priority":"--","component":"Graphics: WebRender","severity":"S3","summary":"Low FPS Scrolling on Touchpad (Windows 4k)","creation_time":"2021-01-27T23:52:47Z"},{"status":"NEW","id":1692035,"last_change_time":"2025-03-21T01:04:21Z","op_sys":"Unspecified","keywords":["perf:responsiveness"],"component":"Performance: 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