some time ago I published an unofficial patch to improve the performance of the designer’s WorkFlow Foundation in the IDE of Visual Studio 2010. I use it enough to edit definitions of Team Build 2010, and this is why I played quite the noses have an IDE so slow.
Yesterday friends of Redmond (after widespread complaints of enough people) have released a HotFix which, inter alia, promises to solve this problem. The full list of fixed issues can be read in KB 2468871 in the More informationsection.
.Net Framework HotFix: http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=3556
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