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Don't laugh, yep, it is true. My host has a dedicated pool of MySQL servers but limits the number of queries per hour to prevent abuse, I guess. Other than the queries limit, I am very happy with the host. Well, if time comes, then I will have to move to a dedicated server.

Thanks for the quick answers. I think the block cache should be removed. First of all, the pages would be double-cached. There is no need for that as FCH is sufficient enough. Secondly, block cache might cause logging-in delays.

I had one block cache enabled and user login page " Thank for ... if ..., blah.. " was stuck for a quite long period of time before finally logging users in. The problem disappeared after the block cache was removed.

So far, FCH has been working great. Thank you for a great hack!

tl