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by stevenwei 5427 days ago
On my 2009 MBP I noticed a significant performance decrease going from Xcode 3 to Xcode 4. It's not unusable, but Xcode 3 was quite snappy by comparison.

You can improve performance slightly in the code editor by turning off the code folding and live issues (which I didn't really care for anyway), but the integrated interface builder is horribly slower than the one in Xcode 3.

Of course now I've upgraded to a 2011 Macbook Air and Xcode 4 performance is now...acceptable.