Following my post about how to troubleshoot a low CPU performance issue with VSTS Test, I will now do the same for lab 4 where we have high CPU in GC.
The scenario is pretty similar in that we have a page (http://localhost/BuggyBits/AllProducts.aspx) that seems to be taking a lot of time to execute. We also see that the w3wp.exe process sits at very high CPU ~100% during the time this page executes.
Using Windbg in the lab, we saw that the issue here was that we were concatenating a very large string in a loop. This was generating a lot of full collections since we were constantly exhausting the large object heap, causing us to spend a lot ...
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