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{"bugs":[{"status":"ASSIGNED","id":1522282,"summary":"Delayed image loading on low end ARM devices","priority":"P1","keywords":["perf:pageload"],"severity":"S3","component":"Performance: Navigation","last_change_time":"2025-03-21T02:42:31Z","op_sys":"Android","creation_time":"2019-01-23T21:52:44Z"},{"status":"ASSIGNED","priority":"P3","summary":"Investigate merging shader cache files","keywords":["perf:startup"],"id":1631949,"last_change_time":"2022-10-12T00:08:45Z","severity":"S3","component":"Graphics","op_sys":"Unspecified","creation_time":"2020-04-21T20:52:29Z"},{"summary":"Google blog page loads very slowly and often fails to fully load","priority":"P3","keywords":["webcompat:blocked","webcompat:platform-bug","webcompat:site-report"],"id":1845775,"status":"ASSIGNED","op_sys":"Unspecified","creation_time":"2023-07-27T16:40:28Z","last_change_time":"2025-03-18T09:18:11Z","severity":"S3","component":"JavaScript Engine"},{"creation_time":"2009-04-01T20:00:41Z","op_sys":"Windows Vista","last_change_time":"2023-05-16T02:23:47Z","component":"Bookmarks & History","severity":"S3","keywords":["blocked-ux","perf"],"priority":"P3","summary":"Poor performance using bookmarks menu with large amounts of bookmarks.","id":486378,"status":"NEW"},{"last_change_time":"2025-03-11T07:58:22Z","severity":"N/A","component":"Places","op_sys":"All","creation_time":"2009-04-29T22:35:30Z","status":"NEW","summary":"[meta] Implement an Asynchronous API for opening container query nodes","priority":"P3","keywords":["main-thread-io","meta","perf","perf:frontend","perf:responsiveness"],"id":490714},{"id":575614,"priority":"--","summary":"{inc} Resizing window is slow for long list with multicol (from \"-moz-column-count: 3\" or \"column-width: 20em;\")","keywords":["perf","perf:responsiveness","testcase"],"status":"NEW","op_sys":"All","creation_time":"2010-06-29T14:36:04Z","severity":"S3","component":"Layout: Columns","last_change_time":"2022-10-10T22:59:55Z"},{"status":"NEW","id":613498,"keywords":["perf","perf:pageload"],"summary":"Very slow chrome to content DOM access","priority":"--","component":"XPConnect","severity":"S3","last_change_time":"2025-03-11T08:46:07Z","creation_time":"2010-11-19T15:34:28Z","op_sys":"macOS"},{"last_change_time":"2022-10-10T23:24:13Z","severity":"S3","component":"Widget","op_sys":"Linux","creation_time":"2011-03-31T18:37:55Z","status":"NEW","priority":"P3","summary":"throttle animation in completely obscured windows (virtual desktop, minimised, hidden behind other fullscreened windows)","keywords":["perf","perf:resource-use"],"id":646937},{"status":"NEW","keywords":["perf","perf:responsiveness"],"summary":"Repeated calls to location.hash = \"#foo\" cause large amounts of disk activity","priority":"P3","id":661590,"last_change_time":"2025-03-11T07:22:06Z","component":"Places","severity":"S3","creation_time":"2011-06-02T18:09:59Z","op_sys":"All"},{"status":"NEW","id":711924,"keywords":["perf","perf:resource-use"],"summary":"Compositing/present still hapens when the only changing parts are out of the viewport","priority":"--","component":"Graphics: WebRender","severity":"S3","last_change_time":"2024-04-08T16:58:41Z","creation_time":"2011-12-19T09:05:20Z","op_sys":"All"},{"creation_time":"2012-06-03T03:18:54Z","op_sys":"All","component":"Graphics: Canvas2D","severity":"S3","last_change_time":"2024-04-05T11:37:58Z","id":760888,"keywords":["perf"],"priority":"--","summary":"IE10 Test Drive: ParticleAcceleration Canvas 2D demo is slow","status":"NEW"},{"creation_time":"2012-10-19T21:25:22Z","op_sys":"All","component":"Networking","severity":"S3","last_change_time":"2023-06-05T16:31:57Z","id":803709,"keywords":["perf:resource-use"],"summary":"We appear to be copying large data URIs over and over in nsSimpleURI.","priority":"P3","status":"NEW"},{"op_sys":"Linux","creation_time":"2012-11-09T08:29:30Z","last_change_time":"2023-06-23T03:10:06Z","severity":"S3","component":"PDF Viewer","priority":"P3","summary":"Processing http://lib.tkk.fi/Dipl/2002/urn007413.pdf is slow, and its text layer is all messed up","keywords":["perf:responsiveness"],"id":810214,"status":"NEW"},{"op_sys":"Windows 7","creation_time":"2012-12-14T13:46:12Z","severity":"S3","component":"CSS Parsing and Computation","last_change_time":"2023-03-01T12:04:23Z","id":821693,"priority":"--","summary":"janky Scrolling on smartsheet.com Sheets","keywords":["perf","perf:responsiveness"],"status":"NEW"},{"status":"NEW","id":827440,"priority":"--","summary":"nsIconChannel::AsyncOpen can block","keywords":["perf"],"severity":"S3","component":"Graphics: ImageLib","last_change_time":"2022-11-24T06:34:31Z","op_sys":"Windows 7","creation_time":"2013-01-07T19:06:03Z"},{"status":"NEW","priority":"--","summary":"Opening huge mercurial long commit page freezing Firefox","keywords":["perf"],"id":827937,"last_change_time":"2022-10-29T12:12:42Z","severity":"S3","component":"Layout","op_sys":"Windows 8","creation_time":"2013-01-08T19:17:33Z"},{"op_sys":"All","creation_time":"2013-01-14T22:07:19Z","last_change_time":"2024-08-20T19:28:43Z","severity":"S3","component":"SQLite and Embedded Database Bindings","summary":"Firefox should abort on tryserver when executing SQL on the main thread","priority":"P3","keywords":["perf:frontend","perf:responsiveness"],"id":830504,"status":"NEW"},{"summary":"Use IOUtils for gLastOpenDirectory","priority":"--","keywords":["main-thread-io","perf:frontend"],"id":837989,"status":"NEW","op_sys":"All","creation_time":"2013-02-05T02:16:08Z","last_change_time":"2023-05-16T02:22:53Z","severity":"S3","component":"General"},{"creation_time":"2013-04-16T15:29:21Z","op_sys":"macOS","last_change_time":"2024-03-27T16:10:09Z","component":"Networking: File","severity":"S3","keywords":["main-thread-io","perf:responsiveness"],"priority":"P3","summary":"nsFileChannel::nsFileChannel causes expensive lstats","id":862383,"status":"NEW"},{"creation_time":"2013-07-07T15:57:11Z","op_sys":"All","component":"Networking","severity":"S3","last_change_time":"2024-04-01T16:26:36Z","id":890712,"keywords":["main-thread-io","perf","perf:frontend"],"summary":"nsIOService::NewFileURI is doing main thread IO and causes jank","priority":"P3","status":"NEW"},{"creation_time":"2013-09-10T12:49:00Z","op_sys":"All","component":"Layout","severity":"S3","last_change_time":"2023-07-27T07:06:57Z","id":914595,"keywords":["perf"],"summary":"Polygon.com page scrolling becomes extremely slow after a while","priority":"--","status":"NEW"},{"creation_time":"2013-09-17T02:34:03Z","op_sys":"All","component":"General","severity":"S3","last_change_time":"2022-10-11T01:07:35Z","id":917090,"keywords":["perf:resource-use"],"summary":"Visibility state is not updated when the browser window is obscured or on another workspace","priority":"--","status":"NEW"},{"priority":"--","summary":"Optimize GetRootPresContext() to avoid going through the viewmanager / view tree","keywords":["perf"],"id":984690,"status":"NEW","op_sys":"Linux","creation_time":"2014-03-18T00:14:52Z","last_change_time":"2022-10-24T12:16:02Z","severity":"S3","component":"Layout"},{"severity":"S3","component":"Toolbars and Customization","last_change_time":"2023-07-19T04:52:40Z","op_sys":"All","creation_time":"2014-06-10T10:02:00Z","status":"NEW","id":1023152,"summary":"Preload panel contents on hover of toolbar button","priority":"--","keywords":["perf:frontend"]},{"creation_time":"2014-08-02T09:50:40Z","op_sys":"All","last_change_time":"2025-03-11T07:09:11Z","component":"Places","severity":"S3","keywords":["perf:frontend"],"priority":"P3","summary":"Make bookmarks toolbar view use async openContainer","id":1047817,"status":"NEW"},{"creation_time":"2014-11-12T00:22:19Z","op_sys":"Android","component":"JavaScript Engine","severity":"S3","last_change_time":"2022-10-11T15:57:30Z","id":1097376,"keywords":["perf"],"priority":"--","summary":"Poor performance in Ember app Discourse","status":"NEW"},{"status":"NEW","priority":"P5","summary":"[e10s] There is a delay for about 1 seconds to display <select> drop-down list with 1600+ items","keywords":["multiprocess","perf","perf:responsiveness","testcase"],"id":1118086,"last_change_time":"2024-09-23T19:34:25Z","severity":"S3","component":"Layout: Form Controls","op_sys":"All","creation_time":"2015-01-06T01:55:10Z"},{"last_change_time":"2023-10-11T11:00:04Z","component":"JavaScript Engine","severity":"S3","creation_time":"2015-04-15T23:32:29Z","op_sys":"Windows 8.1","status":"NEW","keywords":["meta","perf"],"summary":"[Meta] Move JS parsing off of main thread and enable incremental parsing","priority":"--","id":1154987},{"last_change_time":"2024-04-02T23:00:44Z","component":"Graphics: WebRender","severity":"S3","creation_time":"2015-04-16T18:22:07Z","op_sys":"All","status":"NEW","keywords":["perf:animation","perf:responsiveness","reproducible"],"summary":"Very laggy panning and zooming of map on Orbis website","priority":"--","id":1155307},{"status":"NEW","id":1162665,"priority":"--","summary":"ES6 Map performance for large numbers of elements is deficient","keywords":[],"severity":"S3","component":"JavaScript: GC","last_change_time":"2025-03-12T05:36:53Z","op_sys":"Unspecified","creation_time":"2015-05-07T18:46:57Z"},{"last_change_time":"2023-02-19T05:13:03Z","severity":"S3","component":"DOM: Animation","op_sys":"Unspecified","creation_time":"2015-10-10T00:31:34Z","status":"NEW","summary":"2D canvas+HTML/CSS animation demo site broken on Firefox, works great on Chrome","priority":"--","keywords":["perf:responsiveness"],"id":1213513},{"summary":"On/Off opacity changes shouldn't create active layers","priority":"--","keywords":[],"id":1217748,"status":"NEW","op_sys":"All","creation_time":"2015-10-23T09:20:20Z","last_change_time":"2024-09-22T12:08:26Z","severity":"S3","component":"Layout"},{"severity":"S3","component":"JavaScript Engine","last_change_time":"2022-10-11T17:46:56Z","op_sys":"Unspecified","creation_time":"2015-11-05T17:44:28Z","status":"NEW","id":1222086,"priority":"--","summary":"Block JavaScript parser thread when source code characters are not available","keywords":["perf"]},{"status":"NEW","keywords":["perf","regression","testcase"],"priority":"P3","summary":"Low performance of texImage2D with canvas2d and WebGL","id":1246410,"last_change_time":"2024-05-17T08:40:26Z","component":"Graphics: CanvasWebGL","severity":"S3","creation_time":"2016-02-06T17:43:25Z","op_sys":"Unspecified"},{"component":"Graphics: WebRender","severity":"S3","last_change_time":"2025-03-17T20:05:29Z","creation_time":"2016-03-18T17:34:07Z","op_sys":"Unspecified","status":"NEW","id":1257910,"keywords":["perf:responsiveness","reproducible"],"priority":"--","summary":"Firefox hangs with 100% CPU usage when scrolling on specific page"},{"op_sys":"Unspecified","creation_time":"2016-04-20T07:12:37Z","severity":"S3","component":"JavaScript Engine","last_change_time":"2022-10-11T18:13:31Z","id":1265980,"summary":"Running jasmine is slower than Safari and Chrome","priority":"--","keywords":["perf"],"status":"NEW"},{"severity":"S3","component":"Graphics: Canvas2D","last_change_time":"2022-11-08T00:01:53Z","op_sys":"Unspecified","creation_time":"2016-06-07T13:45:20Z","status":"NEW","id":1278554,"priority":"--","summary":"CanvasRenderingContext2D::DrawImage takes lots of time when scrolling Google Spreadsheet","keywords":["perf"]},{"creation_time":"2016-06-19T13:43:03Z","op_sys":"Unspecified","component":"JavaScript: GC","severity":"S3","last_change_time":"2024-08-11T09:37:57Z","id":1280802,"keywords":["perf"],"summary":"Angular framework performance test spends 10% in nursery GC","priority":"P3","status":"NEW"},{"last_change_time":"2022-12-08T15:45:06Z","severity":"S3","component":"Graphics","op_sys":"Linux","creation_time":"2016-06-29T13:06:59Z","status":"NEW","priority":"P3","summary":"Firefox 40+ are very sluggish through x2go","keywords":["perf:responsiveness","regression"],"id":1283089},{"creation_time":"2016-08-12T05:51:58Z","op_sys":"Unspecified","component":"Layout","severity":"S3","last_change_time":"2022-10-11T18:30:52Z","id":1294625,"keywords":["perf"],"summary":"Try to tick refresh driver during html parsing","priority":"P3","status":"NEW"},{"priority":"P3","summary":"Measure and solve sync reflow for studying gdoc performance.","keywords":["perf"],"id":1296161,"status":"NEW","op_sys":"Unspecified","creation_time":"2016-08-18T03:04:45Z","last_change_time":"2022-10-11T18:31:41Z","severity":"S3","component":"Layout"},{"id":1303296,"keywords":["perf"],"summary":"Implement Expected Queueing Time (EQT) for Telemetry/Profiler","priority":"P3","status":"NEW","creation_time":"2016-09-16T09:55:31Z","op_sys":"All","component":"DOM: Events","severity":"S3","last_change_time":"2022-10-11T18:35:56Z"},{"last_change_time":"2024-08-14T04:57:13Z","severity":"S3","component":"General","op_sys":"Linux","creation_time":"2016-10-03T03:00:35Z","status":"NEW","priority":"--","summary":"[Perf] [google docs] Firefox will get 3~9% faster when running gdoc test cases with chrome user agent","keywords":["perf"],"id":1307024},{"creation_time":"2016-10-08T00:18:22Z","op_sys":"Unspecified","component":"Layout","severity":"--","last_change_time":"2025-01-17T17:10:03Z","id":1308660,"keywords":["perf","perf:responsiveness"],"summary":"for background tabs, break refresh driver tick into multiple events off the main thread's event loop","priority":"--","status":"NEW"},{"severity":"S3","component":"JavaScript Engine","last_change_time":"2022-10-11T18:44:06Z","op_sys":"Windows 10","creation_time":"2016-11-11T14:41:11Z","status":"NEW","id":1316864,"priority":"P5","summary":"Google Apps extremely slow -- scrolling, updating text, etc -- unusable","keywords":["perf"]},{"keywords":["hang","meta","nightly-community","perf:frontend"],"priority":"P5","summary":"[meta] Speed and performance of importing bookmarks from JSON or HTML files is awful","id":1320534,"status":"NEW","creation_time":"2016-11-27T11:13:21Z","op_sys":"All","last_change_time":"2025-03-11T08:30:57Z","component":"Bookmarks & History","severity":"--"},{"op_sys":"Unspecified","creation_time":"2017-01-11T03:23:20Z","last_change_time":"2025-03-11T07:51:38Z","severity":"S3","component":"Layout","summary":"DisplayList building shows signs of poor CPU usage","priority":"P3","keywords":["perf:resource-use"],"id":1330187,"status":"NEW"},{"status":"NEW","keywords":["perf:resource-use"],"priority":"P3","summary":"Explore using the presshell arena for 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