We place the SQL server in DataCentre .sometime, my client report that "timeout happend"
When we remote the server and test some query , It seems take over 30 mins
For the normal case, it should take 5 mins.

Any tools or method that I can Test the CPU usage or SQL server performance ??
My client complaint that Our application write some bad program and make the SQL server "dead" or "slow" motion
However, we didn't change any program within this month. so no idea which parts got problem

please help