bugzilla-data-low.json

{"bugs":[{"severity":"S3","last_change_time":"2025-04-24T15:29:17Z","op_sys":"Unspecified","keywords":["perf"],"summary":"Stop looking up GLContext symbols for every new window","status":"ASSIGNED","component":"Graphics","id":1341913,"priority":"P3","creation_time":"2017-02-22T23:15:05Z"},{"severity":"S3","summary":"Delayed image loading on low end ARM devices","last_change_time":"2025-03-21T02:42:31Z","keywords":["perf:pageload"],"op_sys":"Android","status":"ASSIGNED","component":"Performance: Navigation","id":1522282,"priority":"P1","creation_time":"2019-01-23T21:52:44Z"},{"op_sys":"Unspecified","summary":"Investigate merging shader cache files","last_change_time":"2022-10-12T00:08:45Z","keywords":["perf:startup"],"severity":"S3","id":1631949,"component":"Graphics","status":"ASSIGNED","creation_time":"2020-04-21T20:52:29Z","priority":"P3"},{"creation_time":"2023-05-31T08:02:46Z","priority":"P2","last_change_time":"2026-04-01T00:29:04Z","keywords":[],"summary":"Firefox 113.2.0 at Android 13. Audio and video stutter when using bluetooth output.","op_sys":"Android","severity":"S3","id":1835986,"status":"ASSIGNED","component":"Audio/Video: Playback"},{"creation_time":"2026-01-05T20:54:42Z","priority":"--","id":2008619,"component":"Graphics: Text","status":"ASSIGNED","op_sys":"Unspecified","summary":"[meta] Text shaping word cache affects performance on several SP3 tests (particularly TipTap)","keywords":["meta"],"last_change_time":"2026-04-09T17:41:12Z","severity":"S2"},{"creation_time":"2009-04-01T20:00:41Z","priority":"P3","id":486378,"component":"Bookmarks & History","status":"NEW","summary":"Poor performance using bookmarks menu with large amounts of bookmarks.","last_change_time":"2023-05-16T02:23:47Z","keywords":["blocked-ux","perf"],"op_sys":"Windows Vista","severity":"S3"},{"priority":"P3","creation_time":"2009-04-29T22:35:30Z","severity":"N/A","op_sys":"All","summary":"[meta] Implement an Asynchronous API for opening container query nodes","keywords":["main-thread-io","meta","perf","perf:frontend","perf:responsiveness"],"last_change_time":"2025-03-11T07:58:22Z","status":"NEW","component":"Places","id":490714},{"id":575614,"status":"NEW","component":"Layout: Columns","keywords":["perf","perf:responsiveness","testcase"],"summary":"{inc} Resizing window is slow for long list with multicol (from \"-moz-column-count: 3\" or \"column-width: 20em;\")","last_change_time":"2022-10-10T22:59:55Z","op_sys":"All","severity":"S3","creation_time":"2010-06-29T14:36:04Z","priority":"--"},{"component":"XPConnect","status":"NEW","id":613498,"severity":"S3","keywords":["perf","perf:pageload"],"summary":"Very slow chrome to content DOM access","last_change_time":"2025-03-11T08:46:07Z","op_sys":"macOS","priority":"--","creation_time":"2010-11-19T15:34:28Z"},{"severity":"S3","op_sys":"Linux","keywords":["perf","perf:resource-use"],"last_change_time":"2022-10-10T23:24:13Z","summary":"throttle animation in completely obscured windows (virtual desktop, minimised, hidden behind other fullscreened windows)","component":"Widget","status":"NEW","id":646937,"priority":"P3","creation_time":"2011-03-31T18:37:55Z"},{"id":661590,"status":"NEW","component":"Places","last_change_time":"2025-09-29T14:01:38Z","summary":"Repeated calls to location.hash = \"#foo\" cause large amounts of disk activity","keywords":["perf","perf:responsiveness"],"op_sys":"All","severity":"S3","creation_time":"2011-06-02T18:09:59Z","priority":"P3"},{"creation_time":"2011-12-19T09:05:20Z","priority":"--","id":711924,"component":"Graphics: WebRender","status":"NEW","last_change_time":"2024-04-08T16:58:41Z","op_sys":"All","summary":"Compositing/present still hapens when the only changing parts are out of the viewport","keywords":["perf","perf:resource-use"],"severity":"S3"},{"severity":"S3","keywords":["perf"],"last_change_time":"2024-04-05T11:37:58Z","op_sys":"All","summary":"IE10 Test Drive: ParticleAcceleration Canvas 2D demo is slow","component":"Graphics: Canvas2D","status":"NEW","id":760888,"priority":"--","creation_time":"2012-06-03T03:18:54Z"},{"id":803709,"component":"Networking","status":"NEW","op_sys":"All","summary":"We appear to be copying large data URIs over and over in nsSimpleURI.","keywords":["perf:resource-use"],"last_change_time":"2023-06-05T16:31:57Z","severity":"S3","creation_time":"2012-10-19T21:25:22Z","priority":"P3"},{"creation_time":"2012-11-09T08:29:30Z","priority":"P3","op_sys":"Linux","keywords":["perf:responsiveness"],"last_change_time":"2025-03-31T14:05:54Z","summary":"Processing http://lib.tkk.fi/Dipl/2002/urn007413.pdf is slow, and its text layer is all messed up","severity":"S3","id":810214,"component":"PDF Viewer","status":"NEW"},{"priority":"--","creation_time":"2012-12-14T13:46:12Z","severity":"S3","summary":"janky Scrolling on smartsheet.com Sheets","last_change_time":"2023-03-01T12:04:23Z","keywords":["perf","perf:responsiveness"],"op_sys":"Windows 7","component":"CSS Parsing and Computation","status":"NEW","id":821693},{"creation_time":"2013-01-07T19:06:03Z","priority":"--","id":827440,"status":"NEW","component":"Graphics: ImageLib","keywords":["perf"],"op_sys":"Windows 7","summary":"nsIconChannel::AsyncOpen can block","last_change_time":"2022-11-24T06:34:31Z","severity":"S3"},{"priority":"--","creation_time":"2013-01-08T19:17:33Z","status":"NEW","component":"Layout","id":827937,"severity":"S3","last_change_time":"2022-10-29T12:12:42Z","keywords":["perf"],"op_sys":"Windows 8","summary":"Opening huge mercurial long commit page freezing Firefox"},{"creation_time":"2013-01-14T22:07:19Z","priority":"P3","last_change_time":"2024-08-20T19:28:43Z","op_sys":"All","keywords":["perf:frontend","perf:responsiveness"],"summary":"Firefox should abort on tryserver when executing SQL on the main thread","severity":"S3","id":830504,"status":"NEW","component":"SQLite and Embedded Database Bindings"},{"priority":"--","creation_time":"2013-02-05T02:16:08Z","severity":"S3","summary":"Use IOUtils for gLastOpenDirectory","keywords":["main-thread-io","perf:frontend"],"op_sys":"All","last_change_time":"2023-05-16T02:22:53Z","component":"General","status":"NEW","id":837989},{"priority":"P3","creation_time":"2013-04-16T15:29:21Z","status":"NEW","component":"Networking: File","id":862383,"severity":"S3","keywords":["main-thread-io","perf:responsiveness"],"last_change_time":"2024-03-27T16:10:09Z","summary":"nsFileChannel::nsFileChannel causes expensive lstats","op_sys":"macOS"},{"creation_time":"2013-07-07T15:57:11Z","priority":"P3","summary":"nsIOService::NewFileURI is doing main thread IO and causes jank","keywords":["main-thread-io","perf","perf:frontend"],"last_change_time":"2024-04-01T16:26:36Z","op_sys":"All","severity":"S3","id":890712,"component":"Networking","status":"NEW"},{"creation_time":"2013-09-10T12:49:00Z","priority":"--","id":914595,"status":"NEW","component":"Layout","keywords":["perf"],"last_change_time":"2023-07-27T07:06:57Z","op_sys":"All","summary":"Polygon.com page scrolling becomes extremely slow after a while","severity":"S3"},{"creation_time":"2013-09-17T02:34:03Z","priority":"--","id":917090,"status":"NEW","component":"General","op_sys":"All","keywords":["perf:resource-use"],"summary":"Visibility state is not updated when the browser window is obscured or on another workspace","last_change_time":"2022-10-11T01:07:35Z","severity":"S3"},{"component":"Layout","status":"NEW","id":984690,"severity":"S3","op_sys":"Linux","summary":"Optimize GetRootPresContext() to avoid going through the viewmanager / view 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delay for about 1 seconds to display <select> drop-down list with 1600+ items","last_change_time":"2025-12-05T02:06:49Z","keywords":["multiprocess","perf","perf:responsiveness","testcase"],"severity":"S3","id":1118086,"component":"Layout: Form Controls","status":"NEW","creation_time":"2015-01-06T01:55:10Z","priority":"P5"},{"id":1154987,"component":"JavaScript Engine","status":"NEW","op_sys":"Windows 8.1","summary":"[Meta] Move JS parsing off of main thread and enable incremental parsing","last_change_time":"2026-04-07T07:26:45Z","keywords":["meta","perf"],"severity":"S3","creation_time":"2015-04-15T23:32:29Z","priority":"--"},{"creation_time":"2015-04-16T18:22:07Z","priority":"--","id":1155307,"status":"NEW","component":"Graphics: WebRender","op_sys":"All","summary":"Very laggy panning and zooming of map on Orbis website","keywords":["perf:animation","perf:responsiveness","reproducible"],"last_change_time":"2024-04-02T23:00:44Z","severity":"S3"},{"component":"JavaScript: GC","status":"NEW","id":1162665,"severity":"S3","last_change_time":"2025-03-12T05:36:53Z","keywords":[],"summary":"ES6 Map performance for large numbers of elements is deficient","op_sys":"Unspecified","priority":"--","creation_time":"2015-05-07T18:46:57Z"},{"creation_time":"2015-10-10T00:31:34Z","priority":"--","id":1213513,"component":"DOM: Animation","status":"NEW","op_sys":"Unspecified","summary":"2D canvas+HTML/CSS animation demo site broken on Firefox, works great on Chrome","last_change_time":"2023-02-19T05:13:03Z","keywords":["perf:responsiveness"],"severity":"S3"},{"creation_time":"2015-10-23T09:20:20Z","priority":"--","id":1217748,"status":"NEW","component":"Layout","keywords":[],"op_sys":"All","summary":"On/Off opacity changes shouldn't create active layers","last_change_time":"2024-09-22T12:08:26Z","severity":"S3"},{"priority":"--","creation_time":"2015-11-05T17:44:28Z","severity":"S3","summary":"Block JavaScript parser thread when source code characters are not 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Chrome","severity":"S3","id":1265980,"status":"NEW","component":"JavaScript Engine","creation_time":"2016-04-20T07:12:37Z","priority":"--"},{"priority":"--","creation_time":"2016-06-07T13:45:20Z","component":"Graphics: Canvas2D","status":"NEW","id":1278554,"severity":"S3","last_change_time":"2022-11-08T00:01:53Z","op_sys":"Unspecified","keywords":["perf"],"summary":"CanvasRenderingContext2D::DrawImage takes lots of  time when scrolling Google Spreadsheet"},{"priority":"P3","creation_time":"2016-06-19T13:43:03Z","status":"NEW","component":"JavaScript: GC","id":1280802,"severity":"S3","summary":"Angular framework performance test spends 10% in nursery GC","op_sys":"Unspecified","keywords":["perf"],"last_change_time":"2024-08-11T09:37:57Z"},{"creation_time":"2016-06-29T13:06:59Z","priority":"P3","id":1283089,"component":"Graphics","status":"NEW","keywords":["perf:responsiveness","regression"],"op_sys":"Linux","last_change_time":"2022-12-08T15:45:06Z","summary":"Firefox 40+ are very 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Win32","id":1306925,"priority":"--","creation_time":"2016-10-01T23:51:50Z"},{"priority":"--","creation_time":"2016-10-03T03:00:35Z","status":"NEW","component":"General","id":1307024,"severity":"S3","last_change_time":"2024-08-14T04:57:13Z","summary":"[Perf] [google docs] Firefox will get 3~9% faster when running gdoc test cases with chrome user agent","op_sys":"Linux","keywords":["perf"]},{"component":"Layout","status":"NEW","id":1308660,"severity":"--","op_sys":"Unspecified","last_change_time":"2025-04-16T19:29:34Z","keywords":["perf","perf:responsiveness"],"summary":"for background tabs, break refresh driver tick into multiple events off the main thread's event loop","priority":"--","creation_time":"2016-10-08T00:18:22Z"},{"priority":"P5","creation_time":"2016-11-11T14:41:11Z","component":"JavaScript Engine","status":"NEW","id":1316864,"severity":"S3","op_sys":"Windows 10","keywords":["perf"],"last_change_time":"2022-10-11T18:44:06Z","summary":"Google Apps extremely slow -- scrolling, updating text, etc -- unusable"},{"severity":"--","last_change_time":"2025-03-11T08:30:57Z","summary":"[meta] Speed and performance of importing bookmarks from JSON or HTML files is awful","op_sys":"All","keywords":["hang","meta","nightly-community","perf:frontend"],"component":"Bookmarks & History","status":"NEW","id":1320534,"priority":"P5","creation_time":"2016-11-27T11:13:21Z"},{"priority":"P3","creation_time":"2017-01-11T03:23:20Z","severity":"S3","summary":"DisplayList building shows signs of poor CPU usage","op_sys":"Unspecified","keywords":["perf:resource-use"],"last_change_time":"2025-03-11T07:51:38Z","status":"NEW","component":"Layout","id":1330187},{"priority":"P3","creation_time":"2017-01-12T08:37:41Z","severity":"S3","last_change_time":"2022-10-11T18:55:13Z","op_sys":"Unspecified","keywords":["perf:resource-use"],"summary":"Explore using the presshell arena for 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HttpChannelOpenArgs","keywords":["perf"],"last_change_time":"2022-03-02T15:55:52Z"},{"severity":"S3","summary":"nsIDOMWindowUtils::StartFrameTimeRecording should not use sync IPC","last_change_time":"2022-10-11T19:03:23Z","keywords":["perf"],"op_sys":"Unspecified","component":"Graphics: Layers","status":"NEW","id":1343383,"priority":"P3","creation_time":"2017-02-28T23:07:56Z"},{"id":1343538,"component":"Web Painting","status":"NEW","op_sys":"Unspecified","keywords":["perf","perf:responsiveness"],"last_change_time":"2024-11-22T02:22:00Z","summary":"Overpainting on Google docs","severity":"S3","creation_time":"2017-03-01T15:26:14Z","priority":"--"},{"status":"NEW","component":"JavaScript Engine: JIT","id":1346178,"severity":"S3","op_sys":"All","keywords":["perf"],"summary":"Consider compiling Ion IC code less eagerly","last_change_time":"2025-04-30T01:31:39Z","priority":"P3","creation_time":"2017-03-10T12:17:59Z"},{"creation_time":"2017-03-13T20:32:12Z","priority":"--","id":1346927,"component":"WebVR","status":"NEW","last_change_time":"2022-10-11T19:05:40Z","summary":"Replace PVRManager::GetSensorState with lock-free shared memory structure (Eliminating message queue IPC)","op_sys":"Unspecified","keywords":["perf"],"severity":"S3"},{"component":"JavaScript Engine","status":"NEW","id":1347861,"severity":"S3","op_sys":"Unspecified","keywords":["perf"],"last_change_time":"2022-10-11T19:06:12Z","summary":"Consider storing hints during syntax parse","priority":"P5","creation_time":"2017-03-16T09:28:24Z"},{"keywords":["perf"],"summary":"Optimize away OverflowAreasProperty more 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DOMTitleChanged/OnHistoryReload","op_sys":"Unspecified","priority":"--","creation_time":"2017-03-25T15:19:03Z"},{"summary":"Bad performance on Sony Horizon game page","keywords":["perf"],"op_sys":"Unspecified","last_change_time":"2022-10-11T19:08:17Z","severity":"S3","id":1350618,"status":"NEW","component":"Audio/Video: Playback","creation_time":"2017-03-25T21:49:47Z","priority":"P3"},{"id":1350749,"component":"General","status":"NEW","op_sys":"Unspecified","last_change_time":"2022-10-11T19:08:21Z","summary":"Add some instrumentation to find commonly added preference observers","keywords":["perf"],"severity":"S3","creation_time":"2017-03-26T21:54:08Z","priority":"--"},{"component":"Performance: General","status":"NEW","id":1351755,"severity":"--","op_sys":"All","summary":"Provide \"Slight/Light/Low power/Battery saving/Battery saver\" mode 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nsIFrame","op_sys":"All","last_change_time":"2025-05-05T12:26:28Z","keywords":["perf"]},{"id":1352205,"status":"NEW","component":"Layout","op_sys":"Unspecified","keywords":["perf","perf:resource-use"],"last_change_time":"2022-11-02T13:08:34Z","summary":"Avoid running the refresh driver when the page is in background","severity":"--","creation_time":"2017-03-30T20:21:31Z","priority":"P2"},{"priority":"P3","creation_time":"2017-03-31T19:02:50Z","status":"NEW","component":"JavaScript: GC","id":1352524,"severity":"S3","keywords":["meta","perf"],"op_sys":"Unspecified","last_change_time":"2025-05-06T16:14:08Z","summary":"[meta] Improve GC scheduling"},{"creation_time":"2017-04-04T14:54:51Z","priority":"P3","id":1353384,"component":"JavaScript Engine: JIT","status":"NEW","last_change_time":"2025-02-10T18:11:27Z","keywords":["perf"],"op_sys":"All","summary":"Optimize GetName TypeOfNoProperty","severity":"S3"},{"creation_time":"2017-04-09T22:09:43Z","priority":"P3","summary":"Initialize sandbox global properties lazily","op_sys":"Unspecified","last_change_time":"2022-10-11T19:11:14Z","keywords":["perf"],"severity":"S3","id":1354945,"component":"XPConnect","status":"NEW"},{"status":"NEW","component":"Tabbed Browser","id":1355456,"severity":"S3","last_change_time":"2023-07-19T04:59:14Z","summary":"Investigate preparing the next tab on mousedown on the tab close button","op_sys":"Unspecified","keywords":["perf","perf:frontend","perf:responsiveness"],"priority":"P3","creation_time":"2017-04-11T13:02:53Z"},{"summary":"The last window and the task bar item should disappear immediately on shutdown","keywords":["perf:frontend"],"last_change_time":"2023-05-16T02:22:12Z","op_sys":"Unspecified","severity":"S3","id":1355459,"status":"NEW","component":"General","creation_time":"2017-04-11T13:07:05Z","priority":"P4"},{"status":"NEW","component":"Widget: Cocoa","id":1355466,"severity":"S3","summary":"Activating the browser window is janky","op_sys":"macOS","keywords":["perf","perf:responsiveness"],"last_change_time":"2022-10-11T19:11:35Z","priority":"P3","creation_time":"2017-04-11T13:26:24Z"},{"creation_time":"2017-04-14T09:29:21Z","priority":"P3","id":1356532,"component":"Autocomplete","status":"NEW","summary":"Try avoiding layout flushes in autocomplete::_handleOverflow","op_sys":"Unspecified","keywords":["perf:frontend","perf:responsiveness"],"last_change_time":"2024-03-22T08:25:52Z","severity":"S3"},{"creation_time":"2017-04-14T16:14:15Z","priority":"P3","op_sys":"Unspecified","last_change_time":"2022-10-11T19:12:20Z","keywords":["perf:resource-use"],"summary":"Rewrite AppConstants.jsm in C++","severity":"S3","id":1356594,"status":"NEW","component":"General"},{"creation_time":"2017-04-19T11:50:56Z","priority":"P3","keywords":["perf","perf:frontend","perf:responsiveness"],"summary":"Uninitializing UITour is 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