I have no inside knowledge on this but I can see an easy cause for this which can occur in databases which MIGHT be the problem.
The machine processing the requests (the server) can have a limited amount of Ram. Once it's needs to use more Ram than it has available, it can create a 'swap file' where it moves parts of the 'memory requirement' to the hard disk. Writing and reading hard disks is MUCH slower than reading/writing ram.
Once the database grows enough to EXCEED the available ram, you get HUGE slowing as the system as it spends too much time 'swapping' the data from Ram to Disk.
This slowing has happened before and the cure seems to coincide with Dick and Martin 'archiving' the older threads.
I'll email Dick and Martin.
Ian
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