Kai77,
What time of day are you running this. I would suggest bumping the number from 50,000 to 40,000, and running it when your site is least busy.
If you run it when your processor is already working hard, it's not going to make very good time when it has to do this as well.
My forum has about 10,000 members and it's been runnign without a problem for about 2 months now. I run mine at 5AM local time since that's after backup's are done and it's still not very busy.
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