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Comment by cageface | Hacker News Reader

Cocoa without first-class autocomplete is too horrible to contemplate. Unfortunately my 2010 MBP, which ran XCode 3 quite well, doesn't seem to be up to the task of running XCode 4. You know something is wrong when XCode makes Java IDEs look lean & snappy.

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I'm on a 2009 MBP and have no such problems. Don't know where they could originate from, though.

I'm on a 2007 MBP and have no such problems.

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.

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

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.

I think there's something wrong with your system... I was running XCode 4 on a 2006 Macbook (the one with a Core Duo processor), and it worked fairly well. Not as well as my 2011 MBP but it was still usable.

It's usable. It's just annoyingly slow. I'm still getting work done but it feels like swimming upstream.

I too run it on a 2006 MacBookPro1,1, and while it may not be lightning fast, it certainly is not slow. I've heard reports that running in 64bit mode also adds a bit of overhead, which may be impairing his performance, and which we cannot experience because we don't have 64bit processors.

Are you using the new disk-wide FileVault in Lion? I had to turn that off because it was making MacVim and XCode both run horribly slow (apparently they both write to disk constantly).

I am using Lion's whole-disk encryption but it was also really slow in Snow Leopard for me without FileVault.

This might be a long shot, but try deleting the project.xcworkspace directory for your project. I've heard doing that can speed things up.

You really need 8 GB of RAM to make it dealable.

It runs fine on my Mac mini with 2GB of ram. I guess my projects are not very large. I only do iPhone dev on it.

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