Thank you for the quick reply, but your response really doesn’t help.

The problem is not with td_011 which I already wrote is less than 50KB. td_011_log is the problem, which varies between 1MB and 1,5MB. Following your guidelines from previous posts regarding the same issue did nothing, as I wrote before.

It is most definitely not a database issue. The database has been fully optimized, transients cleaned, post revisions and so on.
Even if it was, the link you have provided redirects to some hosting service, so please double check it is correct.