[cageface]

Do you mean that you find XCode 4 responsive? Compared to XCode 3? This isn't stopping me from getting work done but it's very sluggish compared to XCode 3 or even IntelliJ.

Running it as a 32-bit app seems to have helped a bit.

[5hoom]

Personally had no Xcode4 performance issues on 2010 MBP. Seems quite snappy to me (not running filevault though so YMMV...)