Go to http://www.mozilla.org/en-US/firefox/all-beta.html, hold slider and move it up and down. Move it faster and it will be more sluggish.

Forgot to note: Tried with HWA off - still same.

Confirmed on http://hg.mozilla.org/mozilla-central/rev/047c8ba7d2e4 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0a1) Gecko/20120116 Firefox/12.0a1 ID:20120116031100 Regression window(m-c) Works well: http://hg.mozilla.org/mozilla-central/rev/832de5e41bd2 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.2a1pre) Gecko/20110411 Firefox/4.2a1pre ID:20110411140448 Sluggish: http://hg.mozilla.org/mozilla-central/rev/e29f195869ad Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.2a1pre) Gecko/20110411 Firefox/4.2a1pre ID:20110411165559 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=832de5e41bd2&tochange=e29f195869ad Triggered by; e29f195869ad Bas Schouten — Bug 600760: Optimize mask with rectangular clip. r=jrmuizel

After landing Bug 657141 part2, the sluggishness of scroll seems to be fixed.

With the 20120124 build, on Windows XP SP3 and using D3D9 layers acceleration I can still observe the problem.

(In reply to John Volikas from comment #4) > With the 20120124 build, on Windows XP SP3 and using D3D9 layers > acceleration I can still observe the problem. What exactly version # are you using to test?

I can still repro (In reply to Alice0775 White from comment #5) > What exactly version # are you using to test? If you mean Nightly version I already had provided the build date (20120124), and that was version 12.0a1. I can still reproduce on Nightly 13.0a1, 2012-02-03 build. I can't think what other kind of version # you may be wanting, but clarify to me and I will provide all necessary information.

about:jank output for a single drag of the scrollbar to the lowest position (page scrolled at ~ 1FPS) 434 - c-gfx::DrawThebesLayer 9 - c-image::imgFrame::Draw 8 - c-Paint::PresShell::Paint 2 - c-JS::CallEventHandler 1 - c-event::nsViewManager::DispatchEvent

Remaining Sluggishness over here, too: 517 - c-gfx::DrawThebesLayer 153 - c-layout::DoReflow 53 - c-JS::CallEventHandler 19 - c-Paint::PresShell::Paint 18 - c-layout::FlushPendingNotifications 10 - c-CSS::ProcessRestyles 8 - c-nsEventListenerManager::HandleEventInternal 5 - c-image::imgFrame::Draw 2 - c-event::nsViewManager::DispatchEvent 1 - c-storage::Connection::initialize User Agent Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:13.0a1) Gecko/20120203 Firefox/13.0a1 Graphics Adapter Description ATI Radeon HD 4800 Series Vendor ID 0x1002 Device ID 0x9442 Adapter RAM 512 Adapter Drivers aticfx64 aticfx64 aticfx64 aticfx32 aticfx32 aticfx32 atiumd64 atidxx64 atidxx64 atiumdag atidxx32 atidxx32 atiumdva atiumd6a atitmm64 Driver Version 8.930.0.0 Driver Date 12-5-2011 Direct2D Enabled true DirectWrite Enabled true (6.1.7601.17563) ClearType Parameters Gamma: 1800 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 400 WebGL Renderer Google Inc. -- ANGLE (ATI Radeon HD 4800 Series) -- OpenGL ES 2.0 (ANGLE 1.0.0.963) GPU Accelerated Windows 1/1 Direct3D 10 AzureBackend direct2d Btw, setting gfx.content.azure.enabled "true" makes no Difference. Admittedly the Issue also is visible before landing of Bug 600760, so maybe this is a Dupe of/depends on an already filed Perf Graphics Bug.

still seeing laggy scrolling on FF16 nightly with HWA enabled. with HWA disabled, lag is reduced.

Profile : http://people.mozilla.com/~bgirard/cleopatra/#report=684935e3ffd6126a844f2ff98e15f37858efbceb&mergeUnbranched=true&invertCallback=true&selection=%5B%22(total)%22%2C%22mozilla%3A%3Agfx%3A%3ABoxBlurVertical%22%5D With HWA ON, on win7 x64 and D2D. boxblurvertical and boxblurhorizontal feature prominently.

This is much smoother now that https://bugzilla.mozilla.org/show_bug.cgi?id=509052 has landed. The beta site is smooth if normal speed scrolling is used. But if you try to move the slider quickly, the slider lags a bit. plus, the CPU usage can climb to 80-90% if quick scrolling is done.

User Agent: Mozilla/5.0 (Windows NT 6.1; rv:45.0) Gecko/20100101 Firefox/45.0 Build ID: 20160315153207 Hi reporter, I have tested your issue on latest FF release (45.0.1) and latest Nightly build and could not reproduce it. I have accessed the link you provided and dragged the scroll bar faster, but the page was scrolled smoothly. Firefox has the same behavior regardless if HWA or "Use Smooth Scrolling" is enabled or disabled. Is this still reproducible on your end ? If yes, can you please retest this using latest FF release and latest Nightly build (https://nightly.mozilla.org/) and report back the results ? When doing this, please use a new clean Firefox profile, maybe even safe mode, to eliminate custom settings as a possible cause (https://goo.gl/PNe90E). Thanks, Paul.

Just tested with the latest nightly. This site scrolls super smooth now with e10s+APZ. I suggest a resolved workforsome.

Based on Comment 13, changing status to RESOLVED WORKS FOR ME.