bugzilla-data-medium.json

{"bugs":[{"last_change_time":"2025-10-06T13:53:06Z","severity":"S3","priority":"P3","op_sys":"All","creation_time":"2020-04-02T00:26:08Z","status":"ASSIGNED","summary":"WebRender program cache / shader initialization blocks the main thread via the sync IPC message PWebRenderBridge::EnsureConnected (25ms-40ms startup penalty)","keywords":["perf:responsiveness"],"component":"Graphics: WebRender","id":1626816},{"priority":"P3","severity":"S3","last_change_time":"2025-01-06T15:03:33Z","summary":"js::jit::GenerateCode spends a lot of time in malloc lock contention","id":1922073,"keywords":[],"component":"JavaScript Engine: JIT","op_sys":"Android","status":"ASSIGNED","creation_time":"2024-10-01T18:43:40Z"},{"id":216418,"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","component":"Layout","keywords":["perf"],"op_sys":"All","creation_time":"2003-08-17T03:26:28Z","status":"NEW","priority":"--","severity":"S3","last_change_time":"2023-05-15T19:04:00Z"},{"last_change_time":"2024-09-04T13:05:12Z","priority":"--","severity":"S3","creation_time":"2005-08-15T08:01:49Z","status":"NEW","op_sys":"All","id":304683,"component":"Graphics: ImageLib","keywords":["perf:pageload","perf:resource-use","perf:responsiveness","reproducible"],"summary":"firefox struggles with large doxygen html file in nsLocalFile::GetLastModifiedTime (from imgLoader)"},{"last_change_time":"2023-08-23T01:33:13Z","priority":"--","severity":"S3","op_sys":"All","status":"NEW","creation_time":"2011-04-19T08:20:35Z","keywords":["perf:pageload"],"id":651049,"summary":"Write a new off-the-main-thread IO driver for expat","component":"XML"},{"creation_time":"2014-06-18T15:22:41Z","status":"NEW","op_sys":"All","summary":"Make ImageLib share cached imgRequests for the same SVG document even if the URI has a different ref/hash","keywords":["perf:pageload","perf:resource-use","reproducible","testcase-wanted"],"component":"Graphics: ImageLib","id":1027106,"last_change_time":"2025-02-09T16:16:28Z","severity":"S3","priority":"--"},{"priority":"P2","severity":"S3","last_change_time":"2024-06-04T18:21:25Z","summary":"Website causes Firefox to completely hang because same script file is getting loaded over and over again","id":1037984,"component":"New Tab Page","keywords":["csectype-dos","hang","memory-leak","perf:responsiveness","reproducible","testcase"],"op_sys":"All","status":"NEW","creation_time":"2014-07-13T16:33:17Z"},{"priority":"P5","severity":"S4","last_change_time":"2025-03-27T16:27:51Z","summary":"Evaluate aggregating timers to reduce the number of times we wake up the CPU for serving them","id":1107626,"component":"DOM: Core & HTML","keywords":["perf:resource-use"],"op_sys":"All","status":"NEW","creation_time":"2014-12-04T20:16:51Z"},{"last_change_time":"2023-07-24T12:16:09Z","severity":"--","priority":"P3","status":"NEW","creation_time":"2015-05-07T20:09:26Z","op_sys":"All","summary":"Thumbnail generation should have a time limit","keywords":["memory-footprint","memory-leak","perf","perf:responsiveness","top-memory-leak"],"id":1162698,"component":"New Tab Page"},{"summary":"Session Restore generates sustained large disk traffic [meta]","id":1304389,"component":"Session Restore","keywords":["meta","perf:animation","perf:resource-use","perf:responsiveness","reproducible"],"status":"NEW","creation_time":"2016-09-21T13:54:15Z","op_sys":"All","severity":"S3","priority":"--","last_change_time":"2025-12-04T06:38:11Z"},{"priority":"P3","severity":"S3","last_change_time":"2022-10-11T19:06:39Z","component":"Layout","summary":"Consider using FramePropertyTable less in layout","id":1348469,"keywords":["perf","perf:pageload"],"op_sys":"Unspecified","status":"NEW","creation_time":"2017-03-18T03:14:39Z"},{"id":1349809,"summary":"getElevationRequired janks the parent process by doing IO on the main thread","component":"Application Update","keywords":["perf","perf:responsiveness"],"creation_time":"2017-03-23T02:16:50Z","status":"NEW","op_sys":"macOS","severity":"S3","priority":"P3","last_change_time":"2022-10-11T19:07:40Z"},{"priority":"P3","severity":"S3","last_change_time":"2024-04-03T13:53:20Z","summary":"Showing the bookmarks panel is too slow the first time","id":1363131,"keywords":["perf:responsiveness"],"component":"Bookmarks & History","creation_time":"2017-05-08T18:35:31Z","status":"NEW","op_sys":"Unspecified"},{"severity":"S3","priority":"--","last_change_time":"2025-03-24T22:09:33Z","summary":"[meta] Creating the XPCOM system info service shouldn't be expensive","id":1363586,"keywords":["meta","perf","perf:responsiveness","perf:startup"],"component":"XPCOM","op_sys":"Unspecified","status":"NEW","creation_time":"2017-05-10T02:24:10Z"},{"severity":"S3","priority":"P3","last_change_time":"2022-10-11T19:17:24Z","id":1364091,"keywords":["perf","perf:responsiveness","perf:startup"],"summary":"Defer mozilla::widget::AudioSession::Start() until later in startup","component":"Widget: Win32","status":"NEW","creation_time":"2017-05-11T14:44:03Z","op_sys":"Unspecified"},{"status":"NEW","creation_time":"2017-06-06T12:51:51Z","op_sys":"Unspecified","id":1370516,"summary":"NSS should be initialized off main thread","component":"Security: PSM","keywords":["perf:responsiveness","perf:startup"],"last_change_time":"2023-12-11T13:17:23Z","priority":"P2","severity":"S3"},{"component":"Toolbars and Customization","summary":"Add-on icons should be in the navbar by first paint","id":1374216,"keywords":["perf:frontend","perf:startup","regression","regressionwindow-wanted"],"status":"NEW","creation_time":"2017-06-19T08:52:46Z","op_sys":"Unspecified","priority":"P3","severity":"S3","last_change_time":"2022-10-11T19:24:38Z"},{"last_change_time":"2024-12-06T16:27:49Z","severity":"S3","priority":"P3","creation_time":"2017-08-08T21:56:17Z","status":"NEW","op_sys":"Unspecified","keywords":[],"summary":"Add ICs for slotful own-prop Xray property access (property on the expando)","component":"JavaScript Engine","id":1388538},{"op_sys":"macOS","status":"NEW","creation_time":"2017-09-18T08:13:45Z","summary":"Using software video decoders (include VP9) ramps up computer fans on Macbook.","id":1400787,"component":"Audio/Video: Playback","keywords":["perf:resource-use"],"last_change_time":"2022-10-11T19:42:53Z","severity":"S3","priority":"P3"},{"keywords":["perf:responsiveness"],"summary":"stylo: use invalidation framework to handle restyles needed in response to content insertion/removal","id":1406622,"component":"CSS Parsing and Computation","creation_time":"2017-10-07T10:11:51Z","status":"NEW","op_sys":"Unspecified","priority":"P2","severity":"S3","last_change_time":"2022-10-11T19:47:36Z"},{"priority":"P3","severity":"S3","last_change_time":"2025-11-24T20:54:46Z","summary":"With tab animations disabled, closing current tab to switch to another will visibly show a blank page with spinner (causing flashing)","keywords":["perf","perf:frontend"],"component":"Tabbed Browser","id":1425887,"op_sys":"All","status":"NEW","creation_time":"2017-12-18T17:47:35Z"},{"severity":"S3","priority":"P2","last_change_time":"2025-06-11T11:06:28Z","id":1428972,"summary":"RexBench is slower than Chrome/WebKit","component":"JavaScript Engine","keywords":["perf"],"op_sys":"Unspecified","status":"NEW","creation_time":"2018-01-09T05:47:13Z"},{"summary":"Activity stream initialization causes jank after receiving the sessionstore-windows-restored notification","id":1439892,"component":"New Tab Page","keywords":["perf:frontend","perf:startup"],"status":"NEW","creation_time":"2018-02-21T13:15:04Z","op_sys":"Unspecified","severity":"S3","priority":"P3","last_change_time":"2024-04-03T03:06:41Z"},{"last_change_time":"2022-10-11T21:21:11Z","severity":"S3","priority":"P3","op_sys":"Unspecified","status":"NEW","creation_time":"2018-03-05T04:29:30Z","component":"CSS Parsing and Computation","id":1443066,"keywords":["perf","perf:responsiveness"],"summary":"Try to understand why we're slower than Chrome on StyleBench \"Positional pseudo classes : Adding leaf elements: Async\" (& similar \"Removing\" measurement)"},{"severity":"S3","priority":"P3","last_change_time":"2022-10-11T21:23:37Z","keywords":["perf:startup"],"id":1446012,"summary":"The first startup after an update does main thread I/O to update.status several times","component":"Application 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Playback","id":1471029,"keywords":["hang","perf:resource-use","power"],"status":"NEW","creation_time":"2018-06-25T21:14:25Z","op_sys":"All"},{"summary":"Optimize Windows sandbox policy construction","id":1476101,"keywords":["perf:responsiveness","perf:startup"],"component":"Security: Process Sandboxing","creation_time":"2018-07-16T20:44:07Z","status":"NEW","op_sys":"Windows","priority":"P2","severity":"S3","last_change_time":"2022-10-11T21:47:20Z"},{"op_sys":"Unspecified","creation_time":"2018-07-27T10:44:44Z","status":"NEW","summary":"style.foo = bar changes are slow","keywords":["perf:responsiveness"],"id":1478953,"component":"CSS Parsing and Computation","last_change_time":"2022-10-11T21:49:50Z","severity":"S3","priority":"P3"},{"last_change_time":"2025-03-06T17:21:40Z","severity":"S3","priority":"P3","creation_time":"2018-08-08T22:40:31Z","status":"NEW","op_sys":"All","summary":"100% cpu usage and high memory use on page with multiple embedded videos","keywords":["perf:resource-use"],"id":1481967,"component":"Audio/Video: Playback"},{"last_change_time":"2024-09-21T13:28:21Z","severity":"S3","priority":"P3","creation_time":"2018-08-14T19:58:58Z","status":"NEW","op_sys":"Unspecified","summary":"Try and re-attach NewObject stubs after GC","id":1483345,"component":"JavaScript Engine: JIT","keywords":[]},{"last_change_time":"2025-01-29T17:31:27Z","severity":"S3","priority":"P3","op_sys":"macOS","creation_time":"2018-09-04T14:10:08Z","status":"NEW","id":1488435,"summary":"Significant key input delay when typing on large Google Docs","component":"JavaScript Engine","keywords":[]},{"last_change_time":"2025-04-23T10:05:12Z","severity":"N/A","priority":"P5","status":"NEW","creation_time":"2018-09-12T22:40:00Z","op_sys":"Unspecified","summary":"[meta] Long-standing Ion Compilation Time Issues","id":1490847,"component":"JavaScript Engine: JIT","keywords":["meta"]},{"id":1490849,"summary":"Off-Main-Thread Baseline Compilation","keywords":[],"component":"JavaScript Engine: JIT","creation_time":"2018-09-12T22:46:57Z","status":"NEW","op_sys":"Unspecified","priority":"P2","severity":"N/A","last_change_time":"2025-11-20T08:28:19Z"},{"last_change_time":"2025-03-06T17:21:31Z","priority":"P3","severity":"S3","status":"NEW","creation_time":"2018-10-03T15:02:45Z","op_sys":"Unspecified","id":1496096,"summary":"Horrible performance on runningworld due to media decoding","component":"Audio/Video: Playback","keywords":["perf:resource-use"]},{"last_change_time":"2024-05-03T15:18:39Z","priority":"P3","severity":"S3","op_sys":"Android","creation_time":"2018-10-12T07:38:21Z","status":"NEW","component":"JavaScript Engine","id":1498485,"keywords":["perf:responsiveness"],"summary":"hubs.mozilla.com frame rate with an empty scene is too slow in FxR on Oculus Go"},{"last_change_time":"2025-03-11T08:54:07Z","priority":"--","severity":"S3","creation_time":"2018-10-26T12:54:03Z","status":"NEW","op_sys":"All","keywords":["perf:animation","regression","reproducible","top50"],"summary":"Reddit content is no longer displayed when scrolled (checkerboarding), with long restyles","id":1502334,"component":"CSS Parsing and Computation"},{"component":"JavaScript Engine","id":1505192,"summary":"twitch.tv site loads slow compared to Chrome","keywords":["perf:pageload"],"op_sys":"Android","status":"NEW","creation_time":"2018-11-06T22:12:10Z","priority":"P2","severity":"S3","last_change_time":"2022-10-11T22:10:59Z"},{"last_change_time":"2025-03-06T17:04:43Z","severity":"S3","priority":"P3","status":"NEW","creation_time":"2018-11-07T17:49:31Z","op_sys":"Unspecified","summary":"Getting a list of audio devices on about:support is super slow 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GC","keywords":["perf","perf:pageload"],"op_sys":"Unspecified","status":"NEW","creation_time":"2018-12-19T19:35:51Z","severity":"S3","priority":"P3","last_change_time":"2022-10-11T22:19:55Z"},{"last_change_time":"2024-08-03T20:54:28Z","severity":"S3","priority":"P3","op_sys":"Unspecified","creation_time":"2018-12-19T22:43:20Z","status":"NEW","id":1515473,"summary":"CPU intensive slideshow on http://thesantaclausparade.com/","keywords":["perf","perf:responsiveness"],"component":"Graphics"},{"severity":"S3","priority":"P3","last_change_time":"2023-08-05T01:39:19Z","id":1515799,"component":"General","summary":"[meta] reduce impact/overhead of custom element use on startup","keywords":["meta","perf:frontend","perf:startup"],"status":"NEW","creation_time":"2018-12-20T23:13:35Z","op_sys":"Unspecified"},{"op_sys":"Unspecified","status":"NEW","creation_time":"2018-12-27T14:05:19Z","keywords":["perf:frontend","perf:startup"],"summary":"Download indicator code should use idle task and/or not load until there are downloads","component":"Downloads Panel","id":1516525,"last_change_time":"2022-10-11T22:20:48Z","severity":"S3","priority":"P5"},{"op_sys":"Unspecified","status":"NEW","creation_time":"2019-01-17T08:50:51Z","id":1520729,"component":"Layout","summary":"jetbrains \"upsource\" file-view hangs the browser, when scrolled","keywords":["perf:responsiveness"],"last_change_time":"2022-10-11T22:24:11Z","priority":"P2","severity":"S3"},{"severity":"S3","priority":"P2","last_change_time":"2022-10-11T22:25:37Z","keywords":["perf:pageload"],"summary":"InitOtherFamilyNamesRunnable can slow down first page load and take > 100ms","component":"Layout: Text and Fonts","id":1522196,"op_sys":"All","status":"NEW","creation_time":"2019-01-23T18:40:07Z"},{"op_sys":"All","status":"NEW","creation_time":"2019-01-26T00:23:18Z","id":1523028,"summary":"[meta] Performance of \"about:config\"","keywords":["meta","perf","perf:responsiveness","regression"],"component":"Preferences","last_change_time":"2025-03-02T13:58:32Z","priority":"P3","severity":"S3"},{"op_sys":"macOS","creation_time":"2019-01-31T20:58:54Z","status":"NEW","summary":"Twitch.tv video's (vod) freeze during playback on MacOS","id":1524384,"keywords":["perf:responsiveness"],"component":"Audio/Video: Playback","last_change_time":"2025-03-17T17:28:58Z","severity":"S3","priority":"P3"},{"priority":"P2","severity":"S3","last_change_time":"2022-10-11T22:29:04Z","id":1527037,"keywords":["perf:responsiveness"],"component":"Web Painting","summary":"Scroll jank when mousewheel-scrolling slide thumbnails on Google Docs (with lots of time spent painting & in GetFrameForPoint)","op_sys":"Unspecified","status":"NEW","creation_time":"2019-02-11T18:16:31Z"},{"summary":"[meta] Allow call of AsyncOpen and OnStart/OnStopRequest off the main thread","id":1528285,"component":"Networking: HTTP","keywords":["meta","perf:pageload"],"op_sys":"Unspecified","creation_time":"2019-02-15T16:08:16Z","status":"NEW","priority":"P2","severity":"S3","last_change_time":"2025-11-21T13:11:58Z"},{"id":1534371,"keywords":["perf:frontend","perf:startup"],"component":"Menus","summary":"Lazy load browser.xul menus","creation_time":"2019-03-11T18:25:07Z","status":"NEW","op_sys":"Unspecified","severity":"S3","priority":"P3","last_change_time":"2023-08-05T01:38:55Z"},{"last_change_time":"2023-02-01T17:22:05Z","severity":"S3","priority":"P3","status":"NEW","creation_time":"2019-03-19T21:20:53Z","op_sys":"macOS","summary":"[10.14.4] Poor battery life on MacBook Pro","id":1536622,"keywords":["perf","perf:resource-use"],"component":"Graphics"},{"op_sys":"Unspecified","creation_time":"2019-03-20T07:53:47Z","status":"NEW","summary":"Performance is slow/janky with a full complement of add-ons, restored session, opening discarded tabs","component":"General","id":1536739,"keywords":["perf:responsiveness"],"last_change_time":"2024-04-02T13:41:19Z","severity":"S3","priority":"P3"},{"severity":"S3","priority":"--","last_change_time":"2025-03-20T13:08:13Z","component":"XPCOM","id":1538784,"summary":"Set nsThreadPool limits more intelligently","keywords":["perf:resource-use"],"op_sys":"Unspecified","status":"NEW","creation_time":"2019-03-25T17:26:55Z"},{"creation_time":"2019-03-26T20:57:57Z","status":"NEW","op_sys":"Unspecified","keywords":["perf:responsiveness"],"id":1539266,"component":"Graphics","summary":"Running gfxPlatform::Init in the content process can take a long time","last_change_time":"2022-10-11T22:39:22Z","priority":"P3","severity":"S3"},{"op_sys":"Unspecified","creation_time":"2019-03-29T19:18:26Z","status":"NEW","summary":"Brief video and audio interruptions on YouTube when tab is focused after it was in the background","keywords":["perf:responsiveness"],"id":1540226,"component":"Graphics","last_change_time":"2022-10-11T22:40:24Z","priority":"P2","severity":"S3"},{"priority":"P2","severity":"S3","last_change_time":"2025-08-26T15:54:44Z","component":"Crash Reporting","summary":"Avoid nsExceptionHandler::SetupExtraData() doing main thread IO super early on startup","id":1541200,"keywords":["main-thread-io","perf:startup"],"creation_time":"2019-04-02T20:18:11Z","status":"NEW","op_sys":"Unspecified"},{"op_sys":"Unspecified","status":"NEW","creation_time":"2019-04-03T17:10:18Z","keywords":["main-thread-io","perf","perf:startup"],"summary":"Evaluate whether we can stop using compatibility.ini in the common case where app compat info is in profiles.ini / installs.ini","id":1541491,"component":"Startup and Profile System","last_change_time":"2024-07-25T20:36:55Z","priority":"P3","severity":"S3"},{"keywords":["main-thread-io","perf","perf:responsiveness","perf:startup"],"id":1541494,"summary":"Stop writing compatibility.ini piecemeal and on the main thread and on startup","component":"Startup and Profile System","op_sys":"Unspecified","creation_time":"2019-04-03T17:15:49Z","status":"NEW","priority":"P3","severity":"S3","last_change_time":"2022-10-11T22:41:40Z"},{"summary":"Very very very carefully... remove channel-prefs.js and stop reading it from the main thread early on startup","component":"Startup and Profile System","id":1541601,"keywords":["main-thread-io","perf","perf:startup"],"op_sys":"Unspecified","creation_time":"2019-04-03T21:31:57Z","status":"NEW","priority":"--","severity":"S3","last_change_time":"2025-09-30T14:55:10Z"},{"id":1543776,"component":"Performance: Navigation","summary":"[meta] 5+ second delays seen while loading www.allrecipes.com on geckoview_example","keywords":["meta","perf:pageload"],"status":"NEW","creation_time":"2019-04-11T17:55:48Z","op_sys":"Unspecified","severity":"S3","priority":"P2","last_change_time":"2025-03-21T02:42:28Z"},{"id":1544019,"component":"XPCOM","keywords":["main-thread-io","perf","perf:startup"],"summary":"Consolidate IO for startupCache folder access","creation_time":"2019-04-12T14:40:08Z","status":"NEW","op_sys":"Unspecified","severity":"S3","priority":"--","last_change_time":"2023-05-31T19:21:00Z"},{"severity":"S3","priority":"P3","last_change_time":"2022-10-11T22:44:28Z","summary":"Investigate compressing omni.ja's (with lz4)","component":"Startup and Profile System","id":1544504,"keywords":["main-thread-io","perf","perf:responsiveness","perf:startup"],"status":"NEW","creation_time":"2019-04-15T18:19:33Z","op_sys":"Unspecified"},{"severity":"S3","priority":"P5","last_change_time":"2023-06-26T23:49:36Z","summary":"Update service tries to migrate things from \"old update dir\" early on startup and does main thread IO","keywords":["main-thread-io","perf:startup"],"component":"Application Update","id":1545119,"creation_time":"2019-04-17T15:06:25Z","status":"NEW","op_sys":"Unspecified"},{"last_change_time":"2022-10-11T22:47:35Z","priority":"P3","severity":"S3","op_sys":"Unspecified","creation_time":"2019-04-30T16:38:33Z","status":"NEW","id":1548033,"summary":"Only prefetch the parts of XUL.dll  that we actually will need","component":"Startup and Profile System","keywords":["main-thread-io","perf","perf:startup"]},{"op_sys":"Unspecified","status":"NEW","creation_time":"2019-05-02T14:17:10Z","summary":"Stopping blocking bfcache on unconnected peerconnections","id":1548539,"component":"WebRTC","keywords":["perf:pageload"],"last_change_time":"2025-03-03T21:20:28Z","severity":"S3","priority":"P3"},{"summary":"Use minidump-analyzer to append Windows AV/spyware/firewall data to crashreport .extra file; add to telemetry environment data lazily","component":"Crash 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