App in .NET 4.5.1 installing 4.5.2 causes performance drop

So I have an app that was built on .NET 4.5.1. I accidentally installed 4.5.2 and the performance of the application dropped significantly. How would one troubleshoot? According to MS framework upgrades shouldn't affect pre-existing apps, but this one does. Installing a special hotfix KB3026376 (call to get) fixes the performance issue but it is not known why as the issues it addresses are not related to the app.

by TheDewser via /r/csharp

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