+{"bugs":[{"summary":"H3 upload Speed still slow. Three times slower than other browsers.","severity":"S2","op_sys":"Unspecified","status":"ASSIGNED","last_change_time":"2025-09-22T17:43:02Z","creation_time":"2023-09-13T10:36:04Z","keywords":["leave-open","perf:responsiveness","reproducible","top50","webcompat:platform-bug"],"priority":"P1","component":"Networking: HTTP","id":1852924},{"id":1963814,"component":"Password Manager","priority":"--","keywords":[],"creation_time":"2025-05-01T13:52:50Z","last_change_time":"2025-07-03T16:42:57Z","status":"ASSIGNED","op_sys":"All","summary":"Browser UI hang in sqlite3PagerSharedLock during LoginManagerCrypto decryption (via sqlite usage during NSC_DecryptInit for SDR crypto)","severity":"--"},{"last_change_time":"2025-07-01T19:28:26Z","creation_time":"2019-12-10T17:22:25Z","summary":"OSXDisplay::EnableVsync hangs in CVDisplayLinkCreateWithActiveCGDisplays","severity":"S3","status":"NEW","op_sys":"Unspecified","component":"Widget: Cocoa","id":1602842,"keywords":["perf:responsiveness"],"priority":"P3"},{"id":1677509,"component":"Panning and Zooming","priority":"--","keywords":["perf:responsiveness"],"creation_time":"2020-11-16T15:30:13Z","last_change_time":"2025-05-28T19:20:30Z","status":"NEW","op_sys":"Unspecified","summary":"SendReceiveMouseInputEvent often blocks the main thread of the parent process","severity":"S3"},{"severity":"S3","summary":"Lazy font loading can still hang the main thread on Windows","op_sys":"Windows","status":"NEW","last_change_time":"2025-08-22T20:22:21Z","creation_time":"2021-01-26T19:14:50Z","keywords":["perf:responsiveness"],"priority":"--","component":"Layout: Text and Fonts","id":1688951},{"keywords":["meta"],"priority":"--","component":"Performance: General","id":1689392,"summary":"[Meta] investigate performance issues on Reddit.","severity":"--","op_sys":"Unspecified","status":"NEW","last_change_time":"2025-03-11T08:41:57Z","creation_time":"2021-01-28T16:03:57Z"},{"priority":"P2","keywords":["perf:resource-use","reproducible"],"id":1771179,"component":"Web Audio","status":"NEW","op_sys":"Unspecified","summary":"AudioContext power optimizations","severity":"S3","creation_time":"2022-05-25T16:56:04Z","last_change_time":"2025-11-26T06:43:39Z"},{"priority":"P2","keywords":["perf:resource-use","perf:responsiveness","reproducible"],"id":1788530,"component":"Performance","op_sys":"Unspecified","status":"NEW","severity":"S2","summary":"Fenix hangs and memory usage jumps on theguardian.com when opening headlines in new tab","creation_time":"2022-08-31T21:19:22Z","last_change_time":"2025-03-10T23:42:15Z"},{"severity":"S3","summary":"CSS filter() with invert() and hue-rotate() results in sluggish scrolling on Wikipedia","op_sys":"Android","status":"NEW","last_change_time":"2025-10-30T20:58:10Z","creation_time":"2023-04-05T14:45:37Z","keywords":["webcompat:platform-bug"],"priority":"--","component":"Graphics: WebRender","id":1826576},{"priority":"P3","keywords":["perf","perf:responsiveness"],"id":1849393,"component":"Session Restore","op_sys":"Unspecified","status":"NEW","severity":"S3","summary":"Firefox regularly hangs for over half a second in SessionWriter.sys.mjs calling IOUtils.writeJSON serializing a massive JS object when saving tab state","creation_time":"2023-08-18T17:52:57Z","last_change_time":"2025-10-13T08:56:16Z"},{"summary":"Frequent long janks on Android on loading certain pages","severity":"S2","status":"NEW","op_sys":"Unspecified","last_change_time":"2025-11-05T15:23:53Z","creation_time":"2024-06-19T11:50:31Z","keywords":[],"priority":"P2","component":"Storage: Quota Manager","id":1903530},{"last_change_time":"2025-03-20T03:11:36Z","creation_time":"2024-11-04T09:34:27Z","summary":"vizzy.io - The browser is slowed down and eventually stops responding","severity":"S2","status":"NEW","op_sys":"Windows 10","component":"Site Reports","id":1928948,"keywords":["webcompat:needs-contact","webcompat:site-report"],"priority":"P2"},{"status":"NEW","op_sys":"Unspecified","summary":"ChatGPT on clean Firefox install - \"This page is slowing down Firefox.\"","severity":"S2","creation_time":"2025-04-30T12:23:32Z","last_change_time":"2025-12-04T10:31:23Z","priority":"P1","keywords":[],"id":1963578,"component":"JavaScript Engine"},{"op_sys":"Android","status":"NEW","severity":"S3","summary":"m.facebook.com live site loads 100-200ms slower in Fenix than Chrome","creation_time":"2025-06-12T19:54:27Z","last_change_time":"2025-07-04T18:23:19Z","priority":"P3","keywords":["perf:pageload"],"id":1971873,"component":"Performance: Navigation"},{"priority":"--","keywords":[],"id":1988762,"component":"Graphics: WebRender","status":"NEW","op_sys":"Android","summary":"Slow scrolling performance on particular sites (mastodon)","severity":"S2","creation_time":"2025-09-16T14:51:59Z","last_change_time":"2025-12-22T19:55:39Z"},{"component":"Performance Engineering","id":1995805,"keywords":[],"priority":"P3","last_change_time":"2025-11-19T22:29:16Z","creation_time":"2025-10-22T15:48:12Z","severity":"S2","summary":"Fenix cold start applink navigation performance ~1500ms slower than warm, hot scenarios, p75","op_sys":"Unspecified","status":"NEW"},{"last_change_time":"2025-07-01T14:09:09Z","creation_time":"2019-05-10T14:52:25Z","summary":"ContentParent::KillHard janks the main thread","severity":"S3","status":"REOPENED","op_sys":"Unspecified","component":"Crash Reporting","id":1550754,"keywords":["perf:responsiveness","perf:startup","reproducible"],"priority":"--"}]}
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