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I concur with those with cMBP that are also experiencing some lag in scrolling. My 2011 17" also gets choppy scrolling on Facebook with all options turned on both on Lion and Mountain Lion.
 
I knew this was a software flaw ever since I enabled HW acceleration in Chrome and witnessed heavy websites scroll perfectly even when a flash video was running, Engadget for example.

How do you enable hardware acceleration in Chrome? I had assumed it was enabled by default. And is hardware acceleration enabled in Safari and Firefox as well?

Here are my findings on my Retina MacBook Pro with ML GM.

-With discrete graphics and native resolution, everything is butter smooth.
-With discrete graphics and scaled, OS animations are smooth and some sites may slightly stutter in Safari. In Firefox beta, however, everything is butter smooth...

I tried the firefox beta as you mentioned and I too can confirmed its as smooth as butter. So it seems Safari does have some work to do. It will be interesting to see if how the next release of Chrome and Firefox compares with Safari.

I've seen many threads comparing Safari to Chrome; this is the first I've seen a mention of superior performance. So now that Chrome v.21 is out, can anyone speak to how Chrome 21, Safari and Firefox beta compare in performance in Mountain Lion?

Thanks.
 
How do you enable hardware acceleration in Chrome? I had assumed it was enabled by default. And is hardware acceleration enabled in Safari and Firefox as well?





I've seen many threads comparing Safari to Chrome; this is the first I've seen a mention of superior performance. So now that Chrome v.21 is out, can anyone speak to how Chrome 21, Safari and Firefox beta compare in performance in Mountain Lion?

Thanks.

I have post Google Chrome vs Safari here https://forums.macrumors.com/threads/1417755/
 
I don''t know if this has been mentioned on here previously, but I notice that the Safari lag is only really an issue for me when scrolling a zoomed in page (ie if you pinch to zoom in on a column of text in an article for example, which I do a lot). Some sits are a lot worse than others too. I tried Chrome briefly and it does seem better but I prefer Safari so I've been dealing with it. It seems like something that can hopefully be addressed in a future update, not a limit to the hardware, since Chrome doesn't have the issue.

Also I've noticed some bugginess with Safari in 10.8 but only on the retina macbook. for example sometimes when I pinch to zoom, i freezes up safari and I have to quit and restart to fix it. Sometimes it doesn't freeze safari but it slows to a crawl and I can't use fix it until I restart it even if I zoom back out. It definitely feels like a software issue, but only on the retina macbook. On my 'classic' macbook Safari in ML worked great.
 
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