I have Visual Studio 20010 Ultimate on Windows 2008 R2 machine. Last week I applied SP1 and after few days I am experiencing UI freeze for some time around 40 to 60 seconds when I save code changes to files.
I have turned off the background compilation, turned off the antivirus still this problem is not going away.
On my 2008 R2 machine I right clicked on the shorcut for VS2010 and selected properties option. In compatability tab I selected to run VS in compatability mode for Windows server 2008 SP1. There is a checkbox and dropdown for this.
For VS 2010 SP1 it is mentioned that it sets software rendering by default. I thought this might be the reason for UI freeze in some case hence I changed the compatibility setting and it seems to be working fine since then!