Thanks Fabiano.

After Reading a bit on the basics of proccess priority, I found out this same information about realtime.

Changing it to “above normal” would be sufficient for me – it would be above the priority of simple copying made by windows explorer.
But I cant just test it out on the production environment, and the development environment cant simulate the same load we have on production.

I was wondering if anyone ever did this (change firebird’s process priority manually), and what are their experiences with it.