Performance/Triage/Queries/General

Untriaged

Full Query

ID	Summary	Status
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
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
1964744	high cpu memory youtube	UNCONFIRMED
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
1982980	Memory leak in Firefox on Android when repeatedly appending and removing an iframe	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
1988608	Tabs in Firefox refresh when multitasking	UNCONFIRMED
1988762	Slow scrolling performance on particular sites (mastodon)	NEW
1988776	MutationObserver's getReceiverFor is slow when there are a lot of observers	NEW
1993778	Got a new Mac (new to the OS) and noticed only with Firefox does battery drain rapidly, used Firefox Profiler (below) to see if anything stuck out but didn't see anything, any help appreciated	UNCONFIRMED
1994431	Firefox is nearly unusable on a busy system (pages won't load if CPU is used heavily)	UNCONFIRMED

42 Total; 42 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
1993838	WebRender becomes blurry on complex pages at high resolution (5120x1440) with NVIDIA eGPU on Linux (X11)	UNCONFIRMED
1993839	Claude AI Web: Text streaming response causes CPU thread to spike to 100% usage	UNCONFIRMED
1993971	poor audio/video performance using Google Meet with Firefox 142	UNCONFIRMED
1994014	nsLayoutUtils::GetPopupFrameForPoint returns the popup even when hovering over its shadow.	ASSIGNED
1994071	WebRender GPU blocked / disabled on Fedora 43	UNCONFIRMED
1994150	opening browser creates an outofmemoryerror report after crashing	UNCONFIRMED
1994203	SharedMemory{Mapping,Handle} needs a Rust API	NEW
1994206	Translation feature is not available on some devices	NEW
1994314	Fenix: DoH performance shows high latency when resolving multiple hostnames in parallel	ASSIGNED
1994346	In fragmented context, perform a second reflow for abspos frame, or push it	NEW
1994482	Remove session.perf.visibility_event_rcvd_ts @backward-compat shim	NEW
1994549	Firefox unable to load pages or make network requests when other processes are using high CPU on Mac	UNCONFIRMED
1994817	Firefox CPU usage spikes to 100%+ on some sites, particularly when opening new tabs	UNCONFIRMED
1994885	[wpt-sync] Sync PR 55498 - Add WEB_FEATURES.yml for wasm core memory features	NEW
1994907	With "JavaScript" feature enabled on the profiler, testcase from bug 1935829, the browser does 3 5-second long GCs without reducing memory. Manually reducing memory takes 36 seconds without reducing memory.	NEW
1995046	Add perf test for query intent detection	ASSIGNED
1995066	WebGPU CTS regression on Windows: webgpu:api,operation,command_buffer,image_copy:offsets_and_sizes:*	NEW
1995163	[wpt-sync] Sync PR 55531 - Mark element-render-blocking-* slow	NEW
1995180	remove some extra rect creation when calling nsLayoutUtils::RoundGfxRectToAppRect	NEW
1995181	Measuring the memory of a 1GB Blob takes 3 seconds (from about:memory) spending time in shaCompress and SHA_ROTL. Maybe it can be faster?	NEW
1995222	Opening a Chromium issue list is slower in Firefox compared to Chrome	NEW
1995247	Nonsensical default translation direction	NEW
1995265	Massive memory/resource leak in DirectX-using code	UNCONFIRMED
1995281	perf issue: Whole document is serialized when context menu is opened (by buildAskChatMenu via addPageContext)	NEW
1995379	backdrop-filter: blur() severely impacts performance when applied to New Tab card backgrounds	NEW
1995551	[composable toolbar] Performing two consecutive voice searches replaces the first search term with the second one	NEW
1995565	Testcase creating Uint8Array from wasm memory is 2.5x slower in Firefox.	NEW
1995626	from Base64/Hex are slower than chrome	ASSIGNED
1995634	Utilize nsIDocumentEncoder for Translations Language Identification	NEW
1995803	Assertion failure: sf && sf->PresShell() && !sf->PresShell()->IsResolutionUpdated(), at /builds/worker/checkouts/gecko/layout/base/nsLayoutUtils.cpp:783	NEW
1995866	Update browser_ml_semantic_history_search_perf.js to static embeddings	NEW
1995927	Game-of-life demo optimized by chatgpt is 5x slower in Firefox	NEW
1995983	Put bytecode response to in-memory cache	NEW
1995994	Fix memory vs disk cache handling in InstantiateClassicScriptFromCachedStencil	ASSIGNED
1996007	[wpt-sync] Sync PR 55618 - Fix incorrect link to slow-style-change.py iFix incorrect link to slow-style-change.py in update-on-style-change.htmln update-on-style-change.…	NEW
1996009	[LNA] Most strings in the prompt are not translated in Arabic	NEW
1996058	Assertion failure: std::isnan(aSize) || aSize >= 0, at /builds/worker/checkouts/gecko/layout/base/nsLayoutUtils.cpp:1689	ASSIGNED
1996080	Assertion failure: std::isnan(aSize) || aSize >= 0, at /builds/worker/checkouts/gecko/layout/base/nsLayoutUtils.cpp:1691	NEW
1996116	Add a helper function to FuzzingFunctions to kill the GPU process	ASSIGNED
1996144	Noticeable performance drop when zooming in/out on a page or image opened in a new tab	UNCONFIRMED
1996195	wgpu update 2025-10-24	ASSIGNED

41 Total; 41 Open (100%); 0 Resolved (0%); 0 Verified (0%);