> I may be completly wrong but you can try to set
> Sweep interval: 2000
>
> back to zero and check after restarting all computer (if you can) or
> Firbird server - without any connection.
> If it helps you have probably background thread (garbagge cleaning)
> running on server.
> Maybe also good choice to check available hard disc space.
>
> For another (better) advices - ask another person ;-)
>
> Regards
> Boguslaw Brandys

Thanks for the advice, unfortunatley I have already tried turning
sweep to 0 after a backup & restore, performance was the same.

Also, there is more than enough hard drive space available.