Why does Resharper 4.5 testrunner sometimes take forever to start my mstests?

Question

I just copied a Visual Studio solution over from another computer. I haven't done any changes, but the Resharper testrunner takes forever to start up my mstests. When the tests are finally running, they run fast.

There's a JetBrains.ReSharper.TaskRunner.exe which consumes 48% of my total cpu on my dual core.

Visual Studio's internal test runner runs them all instantly.

(VS 2008, R# 4.5.1281 on Windows Vista 64. The other computer without the problems runs on Windows 7 RC.)

Answer 1

You should consider asking JetBrains why this happens

http://www.jetbrains.com/support/resharper/index.html

Answer 2

I got this reply in my mailbox today:

This is a known problem and we're doing our best to fix it. I'll let you know as soon as a fix will become available

Let's hope soon is not far away.