We are running a client/server application on windows server 2008. 12 concurrent users (5 are point of sale). Desktops are on windows xp sp3. We checked all infraestructure. Everything it is complaint. Wiring, switch and workstations. Server it is also domain controller. We are experiencing highly time response delays. We moved to a new server (because of this). Everything was set from start again. Database it is 25 Gb). Everything worked fine for a week only that at first time in the morning transactions started slow for about 5 to 10 minutes. Afertwards everything was normal. However after one week the application crashed. The transactions hits 100% on server and everyone slowed down completely. I need some advice where to read about SQL TUNNING (already made db maintenace)or references to read to check things up that might be wrong. Any kind of help will be appreciated. Meanwhile we are building some perform indicators to get some light on this.