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{"bugs":[{"id":1522282,"keywords":["perf:pageload"],"summary":"Delayed image loading on low end ARM devices","component":"Performance","op_sys":"Android","priority":"P1","severity":"S3","creation_time":"2019-01-23T21:52:44Z","status":"ASSIGNED","last_change_time":"2023-02-22T21:45:14Z"},{"id":1631949,"op_sys":"Unspecified","summary":"Investigate merging shader cache files","keywords":["perf:startup"],"component":"Graphics","creation_time":"2020-04-21T20:52:29Z","severity":"S3","priority":"P3","last_change_time":"2022-10-12T00:08:45Z","status":"ASSIGNED"},{"status":"ASSIGNED","last_change_time":"2025-01-30T15:40:47Z","id":1845775,"priority":"P3","severity":"S3","creation_time":"2023-07-27T16:40:28Z","component":"JavaScript Engine","keywords":["webcompat:blocked","webcompat:platform-bug","webcompat:site-report"],"summary":"Google blog page loads very slowly and often fails to fully load","op_sys":"Unspecified"},{"status":"NEW","last_change_time":"2023-05-16T02:23:47Z","keywords":["blocked-ux","perf"],"summary":"Poor performance using bookmarks menu with large amounts of bookmarks.","component":"Bookmarks & History","op_sys":"Windows Vista","priority":"P3","severity":"S3","creation_time":"2009-04-01T20:00:41Z","id":486378},{"id":490714,"op_sys":"All","keywords":["main-thread-io","meta","perf","perf:frontend","perf:responsiveness"],"summary":"[meta] Implement an Asynchronous API for opening container query nodes","component":"Places","severity":"N/A","creation_time":"2009-04-29T22:35:30Z","priority":"P3","last_change_time":"2024-03-22T08:26:57Z","status":"NEW"},{"last_change_time":"2022-10-10T22:59:55Z","status":"NEW","severity":"S3","creation_time":"2010-06-29T14:36:04Z","priority":"--","op_sys":"All","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;\")","id":575614},{"creation_time":"2010-11-19T15:34:28Z","severity":"S3","priority":"--","op_sys":"macOS","keywords":["perf","perf:pageload"],"summary":"Very slow chrome to content DOM access","component":"XPConnect","id":613498,"last_change_time":"2024-12-09T16:19:44Z","status":"NEW"},{"id":646937,"op_sys":"Linux","summary":"throttle animation in completely obscured windows (virtual desktop, minimised, hidden behind other fullscreened windows)","component":"Widget","keywords":["perf","perf:resource-use"],"creation_time":"2011-03-31T18:37:55Z","severity":"S3","priority":"P3","last_change_time":"2022-10-10T23:24:13Z","status":"NEW"},{"last_change_time":"2025-01-27T09:57:03Z","status":"NEW","id":661590,"creation_time":"2011-06-02T18:09:59Z","severity":"S3","priority":"P3","op_sys":"All","summary":"Repeated calls to location.hash = \"#foo\" cause large amounts of disk activity","keywords":["perf","perf:responsiveness"],"component":"Places"},{"status":"NEW","last_change_time":"2024-04-08T16:58:41Z","id":711924,"summary":"Compositing/present still hapens when the only changing parts are out of the viewport","component":"Graphics: WebRender","keywords":["perf","perf:resource-use"],"op_sys":"All","priority":"--","creation_time":"2011-12-19T09:05:20Z","severity":"S3"},{"id":760888,"severity":"S3","creation_time":"2012-06-03T03:18:54Z","priority":"--","op_sys":"All","summary":"IE10 Test Drive: ParticleAcceleration Canvas 2D demo is slow","component":"Graphics: Canvas2D","keywords":["perf"],"last_change_time":"2024-04-05T11:37:58Z","status":"NEW"},{"component":"Networking","keywords":["perf:resource-use"],"summary":"We appear to be copying large data URIs over and over in nsSimpleURI.","op_sys":"All","priority":"P3","severity":"S3","creation_time":"2012-10-19T21:25:22Z","id":803709,"status":"NEW","last_change_time":"2023-06-05T16:31:57Z"},{"id":810214,"creation_time":"2012-11-09T08:29:30Z","severity":"S3","priority":"P3","op_sys":"Linux","component":"PDF Viewer","keywords":["perf:responsiveness"],"summary":"Processing http://lib.tkk.fi/Dipl/2002/urn007413.pdf is slow, and its text layer is all messed up","last_change_time":"2023-06-23T03:10:06Z","status":"NEW"},{"status":"NEW","last_change_time":"2023-03-01T12:04:23Z","priority":"--","severity":"S3","creation_time":"2012-12-14T13:46:12Z","component":"CSS Parsing and Computation","summary":"janky Scrolling on smartsheet.com Sheets","keywords":["perf","perf:responsiveness"],"op_sys":"Windows 7","id":821693},{"last_change_time":"2022-11-24T06:34:31Z","status":"NEW","id":827440,"op_sys":"Windows 7","component":"Graphics: ImageLib","summary":"nsIconChannel::AsyncOpen can 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while","keywords":["perf"],"component":"Layout","creation_time":"2013-09-10T12:49:00Z","severity":"S3","priority":"--"},{"priority":"--","severity":"S3","creation_time":"2013-09-17T02:34:03Z","summary":"Visibility state is not updated when the browser window is obscured or on another workspace","component":"General","keywords":["perf:resource-use"],"op_sys":"All","id":917090,"status":"NEW","last_change_time":"2022-10-11T01:07:35Z"},{"id":984690,"severity":"S3","creation_time":"2014-03-18T00:14:52Z","priority":"--","op_sys":"Linux","component":"Layout","keywords":["perf"],"summary":"Optimize GetRootPresContext() to avoid going through the viewmanager / view tree","last_change_time":"2022-10-24T12:16:02Z","status":"NEW"},{"last_change_time":"2023-07-19T04:52:40Z","status":"NEW","id":1023152,"creation_time":"2014-06-10T10:02:00Z","severity":"S3","priority":"--","op_sys":"All","keywords":["perf:frontend"],"component":"Toolbars and Customization","summary":"Preload panel contents on hover of toolbar button"},{"status":"NEW","last_change_time":"2023-05-11T18:04:55Z","priority":"P3","creation_time":"2014-08-02T09:50:40Z","severity":"S3","summary":"Make bookmarks toolbar view use async openContainer","component":"Places","keywords":["perf:frontend"],"op_sys":"All","id":1047817},{"status":"NEW","last_change_time":"2022-10-11T15:57:30Z","id":1097376,"priority":"--","creation_time":"2014-11-12T00:22:19Z","severity":"S3","keywords":["perf"],"component":"JavaScript Engine","summary":"Poor performance in Ember app Discourse","op_sys":"Android"},{"last_change_time":"2024-09-23T19:34:25Z","status":"NEW","id":1118086,"creation_time":"2015-01-06T01:55:10Z","severity":"S3","priority":"P5","op_sys":"All","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"],"component":"Layout: Form Controls"},{"op_sys":"Windows 8.1","keywords":["meta","perf"],"summary":"[Meta] Move JS parsing off of main thread and enable incremental parsing","component":"JavaScript Engine","severity":"S3","creation_time":"2015-04-15T23:32:29Z","priority":"--","id":1154987,"last_change_time":"2023-10-11T11:00:04Z","status":"NEW"},{"id":1155307,"creation_time":"2015-04-16T18:22:07Z","severity":"S3","priority":"--","op_sys":"All","summary":"Very laggy panning and zooming of map on Orbis website","component":"Graphics: WebRender","keywords":["perf:animation","perf:responsiveness","reproducible"],"last_change_time":"2024-04-02T23:00:44Z","status":"NEW"},{"last_change_time":"2023-08-29T16:48:48Z","status":"NEW","id":1162665,"severity":"S3","creation_time":"2015-05-07T18:46:57Z","priority":"--","op_sys":"Unspecified","summary":"ES6 Map performance for large numbers of elements is deficient","component":"JavaScript: 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