Performance/Triage/Queries/General

Untriaged

Full Query
ID Summary Status
1688959 Main thread hangs in SendFlushRendering if WebRender is busy NEW
1771902 Compositor CSS animations are not paused in fully occluded windows NEW
1777875 Lenovo Privacy Guard with "Enable this feature when typing passwords" causing excessive UI responsiveness delays (jank) NEW
1880287 tiktok.com - Live videos stop working after a few minutes, stuck loading NEW
1931717 [meta] High OOM rate and CC time in YouTube NEW
1939354 RAM too much UNCONFIRMED
1940667 30s of jank on parent-process doing something around getFixupURIInfo and ContentAreaDropListener.sys.mjs (resource://gre/modules/URIFixup.sys.mjs:278:18) NEW
1941608 Explore AvlTree improvements NEW
1941716 On a fresh profile, Negative heap-unclassified on "My Bugs" query on b.m.o NEW
1942031 Bad canvas performance on this example (nokiadesignarchive.aalto.fi) NEW
1943419 Fluidd memory leak UNCONFIRMED
1943503 High CPU usage on Debian x64 bookworm (VMware player guest) UNCONFIRMED
1943841 (With Ublock or "Snap links plus addon") Testcase generating 1000 iframes is 3.3x slower in Nightly and gets superlinearly slower with increase in number of iframes, uses more RAM, and memory doesnt get released fully if you reload the page NEW
1945665 airbnb.com - Attempting to enter a destination in the search by using the gboard causes the gboard to become unresponsive NEW
1946248 Too much time spent in gfxMacPlatformFontList::DeprecatedFamilyIsAvailable during startup NEW
1946913 Consume too much memory UNCONFIRMED
1949252 Meta Messenger causing high CPU load UNCONFIRMED
1950073 www.kiwico.com - Checkout page becomes unresponsive NEW
1950901 Testcase generating N=5K forms (using credential mgmt API?) takes 30s in parent-process and 50s in content process. Chrome takes 9s. NEW
1955077 Firefox freezes and cause Windows hang when access certain websites UNCONFIRMED
1955509 Constant CPU usage while idle on the Tiki.org website front page UNCONFIRMED
1956850 Ublock Origin increases the time to load a simple demo by 4x and uses ~3x more RAM (time spent in wrappercache, proxy, xraywrapper, minorGC and related stuff) NEW
1957692 Testcase generating N=500 forms and submitting them takes 27s in both parent and content processes,and is 675x slower than Chrome (Part2 of bug 1950901) NEW
1958480 x.com - High battery drain NEW
1958712 Testcase generating N <META> elements is 20x slower than Chrome and does weird stuff in Compositor and SceneBuilder (PAPZCTreeManager::Msg_UpdateZoomConstraints) NEW
1959837 openstreetmap iD editor - slow zooming NEW
1964374 x.com - Scroll lagging after performing a subsequent query NEW
1965718 Google Maps framedrops when I'm panning the map UNCONFIRMED
1966492 JS isn't minified in Fenix release builds NEW
1967143 firefox taking too much memory UNCONFIRMED
1967585 Excessive memory allocation when toolbar icons are updated (e.g., during downloads or extension changes) — sometimes triggers OOM killer UNCONFIRMED
1972941 [Linux] File downloading is CPU-intensive NEW
1975272 Animated newtab background images consume CPU even when not in the foreground NEW
1975348 EspnCricInfo site creates massive CPU and Memory usage FF140.0.2 UNCONFIRMED
1978576 www.kimi.com - Firefox is slower compared to Chrome NEW
1982980 Memory leak in Firefox on Android when repeatedly appending and removing an iframe UNCONFIRMED
1987540 Tab crash/freezes shortly after going fullscreen on a youtube stream UNCONFIRMED
1988312 www.pexels.com - Stuttering/choppy scroll NEW
1988375 RAM ussage very very high UNCONFIRMED
1988605 Facebook search bar animation stutters on Firefox UNCONFIRMED
1988776 MutationObserver's getReceiverFor is slow when there are a lot of observers NEW
1991381 www.notebooksbilliger.de - The page does not instantly load NEW
1991890 getdione.app - Scrolling is laggy NEW
1993424 The list of open tabs is very slow to update and firefox UI hangs when I close just one NEW

44 Total; 44 Open (100%); 0 Resolved (0%); 0 Verified (0%);


Awaiting response to needinfo

Full Query
ID Summary Status
1882916 Firefox consumes a lot of CPU and makes me Mac M2 hang for a good 15 seconds UNCONFIRMED
1961523 Firefox constantly freezes UNCONFIRMED
1963933 Google search results in high CPU usage and spike in temps. Happens with most of the browsers but Firefox results in higher temps spikes and CPU usage UNCONFIRMED
1981274 utter-disappointment-with-firefox-performance UNCONFIRMED
1982631 Google Maps takes forever to load UNCONFIRMED

5 Total; 5 Open (100%); 0 Resolved (0%); 0 Verified (0%);


Recently opened bugs with performance keywords in the summary

Full Query
ID Summary Status
1990856 ANR: GPU fence hang (UI thread in accessibility/graphics allocation, worker blocked on session storage I/O) NEW
1990941 [Tests] Add additional macOS GPU process sandbox tests NEW
1990992 Migrate Android performance tests to use AAB+bundletool instead of APK NEW
1991133 Add Translations RemoteSettings Cleanup Functionality NEW
1991266 Step 12.6 of #performing-a-navigation-api-traversal isn't performed NEW
1991281 Slower and slower response facebook message UNCONFIRMED
1991358 Stop performing JS::FinishCollectingDelazifications/JS::AbortCollectingDelazifications from cache-related code path REOPENED
1991429 5.53 - 5.32% perf_reftest_singletons nth-index-1.html / perf_reftest_singletons nth-index-2.html (Linux) regression on Tue September 16 2025 NEW
1991439 TranslationsEngine timeout may destroy engine during active translation NEW
1991531 Consider adding a shell version of performance.mark and performance.measure NEW
1991667 Firefox performance and usability degrades until system restart on Linux UNCONFIRMED
1991830 sidebar is too slow, stays visible too shortly and expands when the mouse cursor has not touched it UNCONFIRMED
1991838 Freed PHC slots are counted towards its memory limit when they don't consume physical memory NEW
1992066 Brandon Jones' `metaballs` demo for WebGPU fails to run on Intel Macs NEW
1992180 LNA remember this decision text is not translated in AR build NEW
1992205 Weird corner on slack dark mode due to "hidden" resizer input NEW
1992212 Enable WebGPU by default for MacOS Tahoe on ARM architecture ASSIGNED
1992230 Display Translation Error Message in about:translations NEW
1992231 Display Unsupported Detected Language Info Message in about:translations NEW
1992232 Implement about:translations Copy Button NEW
1992233 Imlement about:translations Clear Button NEW
1992234 Add Usage Telemetry to about:translations NEW
1992484 Investigate removing some services from the content sandbox when GPU process enabled NEW
1992488 WebGPU hangs on macOS when executing `webgpu:api,validation,image_copy,layout_related:required_bytes_in_copy:method="CopyB2T";format="bc2-rgba-unorm-srgb";dimension="3d"` NEW
1992531 Switching between tabs with the tab list feels slow and not-responsive due to the tap being ignored after the slide NEW
1992558 Wasm64 high memory usage/memory leak on Windows prevents running Emscripten 'browser64_4gb' suite to completion ASSIGNED
1992567 Memory leak while screen sharing UNCONFIRMED
1992579 Memory leak with F1TV UNCONFIRMED
1992582 Unity's WebGPU backend unable to run because bind groups and layouts are not `null`able UNCONFIRMED
1992608 [Graphics] Fullscreen flicker/blackout on AMD (AMDGPU) after gmp-openh264 plugin update UNCONFIRMED
1992654 WebGPU black canvas on Linux Mint X11 with RadV and Radeon RX 9070 XT UNCONFIRMED
1992771 WebGPU: Bind groups and layouts should be `null`able, but are not NEW
1992779 Measure CPU and memory usage for inference engine runs in telemetry NEW
1992835 Ensure GPU process launch failure before IPDL is retried on Android NEW
1992857 GPUProcessManager::EnsureGPUReady should try failing if backgrounded on Android ASSIGNED
1992891 Make sure we always allow software in the GPU process on non-Windows ASSIGNED
1993036 WebGPU should report Direct3D shader model in about:support and crash reports NEW
1993123 Let macOS GPU process on-by-default ride the trains NEW
1993137 Mac GPU process: crash on time zone change NEW
1993183 WeakMap memory is not correctly accounted for during sweeping NEW
1993207 Speed up fastText WASM by building without exception support NEW
1993212 Investigate allocating WeakMap memory with the buffer allocator NEW
1993229 31.74 - 2.89% Heap Unclassified / Resident Memory + 2 more (OSX, Windows) regression on Tue September 30 2025 NEW
1993246 Very long jank during GC/CC (ghost windows?) UNCONFIRMED
1993256 [composable toolbar] Keyboard not triggered after performing a voice search on Google Pixel 3 XL (Android 9) NEW
1993321 macOS GPU process: Make sure parent endpoint is bound before child endpoint is sent ASSIGNED
1993333 https://huggingface.co/spaces/ibm-granite/granite-docling-258M-WebGPU is a lot slower in Firefox than Chrome and Safari NEW
1993341 Enable WebGPU on older MacOS versions NEW
1993381 Firefox hangs when starting within virtual machine with macOS GPU process enabled NEW
1993383 Frozen tab contents after GPU process crash on macOS, until browser UI repaints ASSIGNED

50 Total; 50 Open (100%); 0 Resolved (0%); 0 Verified (0%);