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
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
1988605	Facebook search bar animation stutters on Firefox	UNCONFIRMED
1988608	Tabs in Firefox refresh when multitasking	UNCONFIRMED
1988776	MutationObserver's getReceiverFor is slow when there are a lot of observers	NEW
1993778	Firefox causes MacBook battery to drain fast	UNCONFIRMED
1994817	Firefox CPU usage spikes to 100%+ on some sites, particularly when opening new tabs	UNCONFIRMED
1999165	Hanging Constantly 144x	UNCONFIRMED
1999598	Firefox for macOS is using a lot of battery	UNCONFIRMED
2001588	Zooming in and out on https://www.tcm.com/schedule is slow	UNCONFIRMED
2001751	145.0.1 hogs cpu	UNCONFIRMED
2001871	private window seems to slow and crash all of firefox	UNCONFIRMED
2002153	Laggy Youtube in-Video UI	UNCONFIRMED
2002920	Drag-and-drop 5MB of text on an blank tab leads to recurring 4.5s jank on the parent-process, spending time in nsIURIFixup.getFixupURIInfo	ASSIGNED
2003401	Firefox 145.0.2 reproducibly locks-up UI	UNCONFIRMED
2003583	chase.com - 145.0.2 is incompatible with Chase Online Banking features	UNCONFIRMED
2003795	store.steampowered.com - GPU usage significantly increases causing performance issue	NEW
2005342	Regular massive memory leak	UNCONFIRMED
2005548	High ram usage in Youtube site when uBlock Origin is enabled.	UNCONFIRMED
2005613	Opening the Suggest database on Android does a lot of IO (32MB read + 16MB write)	NEW
2005635	decathlon.fr website consuming CPU while not displayed	UNCONFIRMED
2006540	Extensions Using 150% CPU During Normal Browsing	UNCONFIRMED
2006766	Firefox started using 2.5 to 3 GB of RAM. I have the same number of tabs open as usual--maybe only a few more.	UNCONFIRMED
2007114	www.bilibili.com - Excessive GPU resources are being used during video play with "danmaku" feature enabled	NEW
2007324	hianime.pe - Memory fluctuations when watching videos	NEW
2007363	Firefox 146 on Mac OS Tahoe 26.2, massive memory leak	UNCONFIRMED

58 Total; 58 Open (100%); 0 Resolved (0%); 0 Verified (0%);

Awaiting response to needinfo

Full Query

ID	Summary	Status
1961523	Firefox constantly freezes	UNCONFIRMED
1981274	utter-disappointment-with-firefox-performance	UNCONFIRMED
1982631	Google Maps takes forever to load	UNCONFIRMED

3 Total; 3 Open (100%); 0 Resolved (0%); 0 Verified (0%);

Recently opened bugs with performance keywords in the summary

Full Query

ID	Summary	Status
2005093	WebGPU should not overload `ImplCycleCollectionTraverse` and `ImplCycleCollectionUnlink` for arbitrary `nsTArray<RefPtr<T>>`	NEW
2005225	Full screen mode switch is slower with pinned tabs	NEW
2005283	Is WebKit shaping 50x faster than Firefox?	NEW
2005317	Implement PerformanceEventTiming targetSelector attribute	NEW
2005341	7.8 - 7.04% damp jstracer.profiler-recording-performance.DAMP / damp jstracer.profiler-recording-performance.DAMP (Linux, Windows) regression on Mon December 1 2025	NEW
2005365	Add inference performance metrics collection to llama.cpp runtime	NEW
2005369	Add inference performance metrics collection to StaticEmbeddingsPipeline	NEW
2005415	Evaluate scheduled vs lazy cleanup for AI Window Security Layer memory management	NEW
2005428	Document WebGPU cycle collection macros	ASSIGNED
2005459	99% tenuring rate on an artificial testcase that creates N Uint8Array(N). Firefox is 2x faster than Chrome though.	NEW
2005489	Unify UDP code across Fast UDP I/O, NSPR, and MASQUE CONNECT-UDP	NEW
2005560	Firefox hangs/freezes or uses too much memory, can't watch youtube videos	UNCONFIRMED
2005606	MASQUE proxy (HTTP/3) 56% slower than HTTPS proxy (HTTP/2) for 32MB file uploads on uploadtest.appspot.com (Windows)	NEW
2005702	Treat islamic-rgsa as an unknown calendar identifier	NEW
2005791	Test storage initialization performance with old profiles	NEW
2005792	Performance bug in redesigned synced tabs list composable	NEW
2005801	Deeply-nested inline elements are slower to reflow in Firefox than in other browsers	NEW
2005828	Mouseleave events do not fire for SVG elements when their display is set to 'none' until a user initiated mousemove is performed	NEW
2005911	Modified Codepen demo (https://codepen.io/armanb/pen/WbwmPrp) is 3.7x slower in Firefox, spending time around strings/allocation, MajorGC and MinorGC	NEW
2005979	Testcase with floats is 15x slower in Firefox, quadratic, and spending 70% of time in nsFloatManager::FloatInfo::IsEmpty and nsFloatManager::FloatInfo::BEnd	NEW
2005983	Testcase generating N shapes with different line lengths is 66x slower in Firefox, spending time in ComputeLineIntercept	NEW
2005987	Update WebGPU CTS to new version b231a8cb24882dc5cb19655053515c4c34f28520 from 2025-12-12 23:54:56	REOPENED
2006273	Slow scrolling, bad performance on image slider	UNCONFIRMED
2006356	12.69 - 4.83% shopify-applink-startup org.mozilla.fenix-cpu-time / shopify-applink-startup applink_startup + 2 more (Android) regression on Thu December 4 2025	NEW
2006400	Add an eval test type that can run mochitests in mozperftest	NEW
2006413	Create an eval layer in mozperftest that runs python evals from toolkit/components/ml/evals	NEW
2006462	test_http3_fast_fallback.js takes long time to complete	NEW
2006672	Search suggestions providers memory leak in SearchFragmentState	NEW
2006674	Search suggestions providers memory leak in BrowserState	NEW
2006679	Windows Dynamic Refresh Rate causes poor scrolling performance	NEW
2006720	WebGPU: `GPUSupportedLimits.maxStorage{Buffers,Textures}In{Vertex,Fragment}Stage` are unrecognized	NEW
2006901	100% browser_ml_summarizer_perf regression on Thu December 18 2025	NEW
2006908	Add tests to measure performance of fetching small resources	NEW
2006975	High CPU usage when rendering complex animated SVG (Lottie) in Firefox	UNCONFIRMED
2007007	Handle about:translations select keyboard navigation	NEW
2007073	Testcase generating and triggering MutaionObservers is quadratic/slow in different ways.	NEW
2007229	Testcase Creating a dropdown with long repeated string is 2.6x slower in Firefox., spending time in textshaping (and calculating bounds?)	NEW
2007351	Update WebGPU CTS to new version d5a131f3afc77be7f76bbf956db054e799f2e79d from 2025-12-19 22:41:23	ASSIGNED
2007355	Top addressbar can be translated offscreen while the navbar can remain shown	NEW
2007381	In the new search bar, After performing a search using a `This time search` engine, it should be return to the default engine.	NEW
2007462	Firefox for Android contains incomplete and inaccurate translations in my native language.	UNCONFIRMED
2007497	26.86 - 22.35% tab-restore-shopify org.mozilla.fenix:gpu-cpu-time / tab-restore-shopify org.mozilla.fenix:gpu-cpu-time (Android) regression on Wed December 10 2025	NEW
2007510	webgpu canvas opaque alphaMode does not work	UNCONFIRMED
2007551	Use swap-horizontal.svg in about:translations	NEW
2007582	Expand Fenix DoH performance tests to cover more devices	ASSIGNED
2007600	WebGPUParent::ActorDestroy does not need to poll all devices	ASSIGNED

46 Total; 46 Open (100%); 0 Resolved (0%); 0 Verified (0%);