I have a fairly simple project with only two XIBs, 5 custom classes and 5 frameworks (CFNetwork, QuartzCore, UIKit, Foundation, CoreGraphics). I was using XCode 3.x before and recently updated to XCode 4. After I did, build times are sometimes up to a minute, typically about 30 seconds. I have an 2.4 GHz MBP with 4GB of memory.

![enter image description here](https://i.stack.imgur.com/7Jv1L.png)

Looking at the build log in log navigator, I see "check dependencies..." come up for a long time, everything else happens nearly instantly. However clicking on this log entry doesn't reveal any more details. Where could I find more detailed info about what is causing this?

**Update:**

After rebooting, build returned to normal speed. There was possibly something happening in the background that was causing the slowdown.