Bug 245783 depends on 72 bugs:

•    245783: [GTK] Slow performance issues tracker bug (scrolling, animations, drag & drop, input) [NEW; assigned to webkit-unassigned]
  •    208249: With Epiphany, mouse hovers across the emails list in GMail is noticeably slower than Firefox [NEW; assigned to webkit-unassigned]
  •    215045: [GStreamer] Very slow when scrolling Divi websites [NEW; assigned to webkit-unassigned]
    •    280921: [GTK] Scrolling through Divi's features presentation page crashes MiniBrowser's web process, images stop loading [NEW; assigned to webkit-unassigned]
  •    220085: Scrolling is slow / janky on Tweetdeck (Twitter) with Epiphany web apps [NEW; assigned to webkit-unassigned]
  •    221738: [GTK][WPE] Async Scrolling: Slow scrolling and CSS animations on a static page [REOPENED; assigned to cgarcia]
  •    222902: [GTK] Very bad performance on a 4K display [NEW; assigned to webkit-unassigned]
  •    223970: Dogslow scrolling on Twitter with any Epiphany window [NEW; assigned to webkit-unassigned]
  •    225512: [GTK] Use always async scrolling in accelerated compositing mode [REOPENED; assigned to webkit-unassigned]
    •    225740: REGRESSION(r277258): Caused layout test failures [RESOLVED FIXED; assigned to commit-queue]
  •    233126: [gtk] Very slow to open a gtk+ GitLab page [NEW; assigned to webkit-unassigned]
  •    234700: [GTK] CSS property background-blend-mode: luminosity generates major slowdown on GNOME Web [NEW; assigned to webkit-unassigned]
  •    238578: [GTK] WebKitGTK3's compositing has extremely slow typing performance on Intel Sandybridge graphics with multiple screens/monitors and makes Evolution's HTML mail composer unusable [NEW; assigned to webkit-unassigned]
  •    240865: [GTK] Webpages completely slow down when CSS blur filter is in use [NEW; assigned to webkit-unassigned]
  •    250988: [GTK] Slow scrolling of the Tiki website frontpage [NEW; assigned to webkit-unassigned]
  •    250998: [GTK] Very slow scrolling on Apple's product pages on 4K HiDPI displays [NEW; assigned to webkit-unassigned]
  •    251016: [GTK] Youtube dark theme's "Ambient Mode" creates extreme slowness, destroys playback and UI performance on Epiphany [NEW; assigned to webkit-unassigned]
  •    252249: [GTK] Severe lag when editing documents on Google Docs, chatting on Google Chat, commenting on long GitLab merge requests [NEW; assigned to webkit-unassigned]
  •    252846: [GTK] Slow to load most banking websites [NEW; assigned to webkit-unassigned]
    •    315236: Content rule list store may end up copying compiled bytecode files [RESOLVED FIXED; assigned to aperez]
  •    254985: [GTK] YouTube player -- "Scroll for more details" stutters and uses unreasonably much CPU [NEW; assigned to webkit-unassigned]
  •    256105: [GTK] Extremely slow animation of scaled images with shadows on the Divi theme website showcase page [NEW; assigned to webkit-unassigned]
  •    256454: [GTK] moving mouse around in YouTube fullscreen mode causes significant jump in CPU usage [NEW; assigned to webkit-unassigned]
  •    258926: [GTK4] Scrolling with high-res mouse wheel is slow/laggy due to smooth scrolling. [NEW; assigned to webkit-unassigned]
  •    258931: [GTK] Extreme slow resizing performance on the Web Inspector window (or panes) on Wayland [NEW; assigned to webkit-unassigned]
  •    259227: [GTK] Allow automatically pausing the previously playing video with sound when another one starts playing in a newly created tab / window [NEW; assigned to webkit-unassigned]
  •    264966: [GTK] Slow CSS animations and dropped frames when animating `transition-property: transform, filter;` on `filter: opacity` with more than 2 large images [NEW; assigned to webkit-unassigned]
  •    265048: [GTK] Slow CSS animations and dropped frames when doing a transition using a gradient as an alpha mask between large images [NEW; assigned to webkit-unassigned]
  •    267774: [GTK] Slow to load GMail's inbox (or search results) [NEW; assigned to webkit-unassigned]
    •    315236: Content rule list store may end up copying compiled bytecode files [RESOLVED FIXED; assigned to aperez] (*)
  •    271233: [GTK] Scrolling on YouTube is stuttery if pointer hovers over video thumbnails [NEW; assigned to webkit-unassigned]
  •    271234: [GTK] Extremely slow rendering performance on a certain site [NEW; assigned to webkit-unassigned]
  •    274218: [GTK] Spinners are shown indefinitely on HTML5 audio controls with preload=none, wasting power and CPU [NEW; assigned to webkit-unassigned]
  •    276845: [GTK] Janky repainting while resizing browser window, and GPU artifacts on open source AMD graphics [NEW; assigned to webkit-unassigned]
  •    278692: [GTK] Slow scrolling on Hotels.com search results listings [NEW; assigned to webkit-unassigned]
  •    278695: [GTK] WebGL: slow framerate, sluggish panning on the F4 demo 3D map of Paris with lots of trees [NEW; assigned to webkit-unassigned]
  •    280920: [GTK] [Skia] Minibrowser is slow to scroll in 4K HiDPI on immigration consulting website's front page [NEW; assigned to webkit-unassigned]
  •    290155: [GTK] Constant CPU usage while idle on the front page of tiki.org [NEW; assigned to webkit-unassigned]
  •    291791: [GTK] Constant 300% CPU usage on the Loop fintech website's front page due to animations [NEW; assigned to webkit-unassigned]
  •    291796: Loading TheGlobeAndMail.com, CNN.com, Kotaku.com is slower than in Firefox [NEW; assigned to webkit-unassigned]
    •    315236: Content rule list store may end up copying compiled bytecode files [RESOLVED FIXED; assigned to aperez] (*)
  •    297201: [GTK] Georges' GUADEC 2025 blog post makes Epiphany lag and block input during scroll [NEW; assigned to webkit-unassigned]
  •    301066: Sluggishly slow typing input in GitLab's issue description textfields [NEW; assigned to webkit-unassigned]
  •    305290: [GTK] Dragging the scrollbars becomes extremely slow after resizing the browser window (or webview) on some websites [NEW; assigned to webkit-unassigned]
  •    310814: [GTK] Laggy (stuttering) scrolling on the Boisés Est WordPress website's front page carousel [NEW; assigned to webkit-unassigned]
  •    315135: [GTK] Loading www.wikipedia.org results in over 2000 calls to SkFontMgr_fontconfig::onMatchFamilyStyle, which is slow [NEW; assigned to webkit-unassigned]
  •    322024: High CPU usage on Wise.com's website (without visible animations and videos), especially the "business" page [NEW; assigned to webkit-unassigned]
  •    328984: canaleeuropa.tv doesn't work and crashes the browser [NEW; assigned to webkit-unassigned]
  •    143868: [GTK] Slow to render simple page with 20.000 lines [RESOLVED WORKSFORME; assigned to webkit-unassigned]
  •    170347: [GTK] Intel HD Graphics 3000 GPU hangs with WebKitGTK+ 2.1[4|6].x [RESOLVED FIXED; assigned to webkit-unassigned]
  •    185579: [GTK] Slow scrolling on reddit.com [RESOLVED FIXED; assigned to webkit-unassigned]
  •    198857: [GTK] Some site is unbearably slow to load [RESOLVED WORKSFORME; assigned to webkit-unassigned]
  •    238415: [GTK4] Frequent UI process hangs [RESOLVED WORKSFORME; assigned to webkit-unassigned]
  •    239934: [GTK] Painfully slow browsing experience [RESOLVED WONTFIX; assigned to webkit-unassigned]
  •    245124: [GTK] Linkedin's feed page hangs [RESOLVED WORKSFORME; assigned to webkit-unassigned]
  •    247748: [SOUP] Network requests take very long time to complete on cnn.com [RESOLVED DUPLICATE; assigned to webkit-unassigned]
  •    248224: [GTK] YouTube player is unresponsive, extremely slow scrolling on pages with video [RESOLVED FIXED; assigned to webkit-unassigned]
  •    249145: [GTK] Graphics regressions in 2.39.1 [RESOLVED FIXED; assigned to webkit-unassigned]
    •    248221: REGRESSION(2.39.1): [GTK] Position snapping and animations on apple.com don't work [RESOLVED FIXED; assigned to webkit-unassigned]
    •    248223: REGRESSION(2.39.1): [GTK] Significant graphics performance regressions [RESOLVED FIXED; assigned to webkit-unassigned]
    •    249125: [GTK] WebGL not available with USE_ANGLE_WEBGL and sandbox enabled [RESOLVED DUPLICATE; assigned to webkit-unassigned]
  •    250978: [GTK] Unexpectedly unloads images from Artstation galleries (also, janky scrolling) [RESOLVED DUPLICATE; assigned to webkit-unassigned]
  •    251017: [GStreamer] VA-API (GstVA) hardware-accelerated video decoding playback above 1080p resolution on YouTube in VP9 is very slow and stutters [RESOLVED FIXED; assigned to webkit-unassigned]
  •    251336: [SOUP] Very slow to load the CNN or Globe and Mail websites [RESOLVED MOVED; assigned to webkit-unassigned]
  •    252545: [GTK][WPE] Constant high idle CPU usage in front of any logged in page on Trello.com [RESOLVED FIXED; assigned to cgarcia]
  •    252948: [GTK] Peculiar performance issue on https://www.axiom.co/pricing [RESOLVED FIXED; assigned to webkit-unassigned]
  •    255713: [GTK] High idle CPU usage on canva.com [RESOLVED FIXED; assigned to webkit-unassigned]
  •    256123: [GStreamer] Constant CPU usage on autoplaying videos, even when out of viewport [RESOLVED FIXED; assigned to philn]
  •    256460: [GTK] Reddit alternates between low and high CPU usage when idle [RESOLVED FIXED; assigned to webkit-unassigned]
  •    256756: [GTK] The stutters are back [RESOLVED FIXED; assigned to cgarcia]
  •    271232: [GTK] Blurs on reddit.com are extremely slow [RESOLVED FIXED; assigned to webkit-unassigned]
  •    285167: [GTK] Monitor window surfaces obscured by other windows (to suspend tabs, stop the frame clock and tell web apps to throttle themselves) [RESOLVED FIXED; assigned to cgarcia]
  •    291369: Figure out a way to implement idle tab discarding (unloading tabs from RAM) to reduce memory usage on Linux [RESOLVED WONTFIX; assigned to webkit-unassigned]
  •    291842: Epiphany unable to restore TheConversation tabs (infinite loading), only works when forcing load by pressing Enter [RESOLVED DUPLICATE; assigned to webkit-unassigned]
  •    319590: [Skia] Memory growth on every page load when fonts with variations are used [RESOLVED FIXED; assigned to plampe]

Bug 245783 does not block any bugs.