I'm writing first time on this website, because I have big problem with css3 exactly box-shadow, so I start from the beginning :) I made website and it worked good until I changed all graphic. I did box-shadow and now my website works very slow (exactly scrolling). It is address: skuterpl.vot.pl (version with new graphic and box-shadow) strona.pzs1.pl (Old version with old graphic and without box-shadow, this website works very good). I'm asking you for help me with this problem.
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If you have a very large shadow radius, it can affect performance - there's a post here about it affecting webkit browsers CSS3 box-shadow causes scroll-lag (slow performance) on Safari 5.0.2? , though I believe now fixed.
Lowering the amount of box-radius blur should solve the issue.
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things you should take notice of certain factors that can slow down a page:
- heavy graphics (like huge backgrounds)
- a fixed background
- element opacity / image transparency
- animated images
- text/box shadows
- constantly running scripts/event firing (like scrolling events)
although the old page works, i can still see some things that need optimization.

Joseph
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Graphic is good, because if I turn off all box-shadow, website works good, so the problem is box-shadow and it need some fix. – SkuterPL Feb 08 '12 at 09:43