We just released a hotfix for an issue where you get 100% CPU in vbc.exe when compiling large applications in Microsoft Visual Studio 2008.
Apart from the 100% CPU situation you may also notice symptoms like visual studio taking a very long time to return or error messages like
Error 246 Timed out waiting for a program to execute. The command being executed was "C:\Windows\Microsoft.NET\Framework\v3.5\vbc.exe" /noconfig @"C:\TempFiles\MyApp\8ec39ce7\e41b4e32\gpznqwbu.cmdline".
or
C:\MyProjects\MyPage.aspx(4): Build (web): Object '/32eba493_7a69_40af_bfe6_52887ab07396/jdkqqpvt_pufe5n+ogossdnv_258.rem' has been disconnected or does not exist at the server.
The issue will not appear if you set debug="false" in web.config.
The reason for this issue is that vbc.exe (the vb.net compiler) is spending a lot of time compiling and copying pdb files ...
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