Debugging Tests in VS2008 Slow due to loading symbols

If I click on 'debug all tests' in Visual Studio 2008 it takes ages to start (whereas 'run all tests' starts instantly). As far a can tell, this is because it is downl开发者_如何学JAVAoading symbols from Microsoft. Why is this? Is there anyway I can stop it or to make it start faster?

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Go to Tools > Options > Debugging > Symbols and check the box for "Search the above locations only when symbols are loaded manually."

It won't affect breakpoints or anything; the only thing it means is when you see a callstack without symbols you have to right click the frame in the callstack and "Load Symbols > From Symbol Path".