Hi guys, weird thing happened to one of our DB production servers. Monday morning, one of our database servers was rebooted because of an DC [Domain Controller]issue. Reboot happened on monday during the day. The rest of the day, no issues. Next day, as soon as clients started connecting\working, they informed us that the application was reacting extremely slow. First thought was: well with the reboot, temp db is being flushed\recreated, buffer pool has been flushed so it takes a while before we get normal performance. By friday the performance issue was still existing. This server has 24 cores and 64 gb memory. Only thing running on this server are about 6 databases with a total of 500 gb. 2 majors, each 200gb and 4 small databases. Things I've done the past 48 hours - I started with hardware checks, no errors. - I 've rebuild the indexes - Altered parallelisme value. Since the reboot i saw that the latch was reaching values of 7000ms. I don't know what the value was last week when everything was running fine but this should be somewhere between 0 and 50. When i checked the settings, i saw that the Parallelisme value was 24 [as the server has 24 cores], i decided to lower this to 4. The latch value decreased immediately to 0 - 10m. I've spend the whole weekend looking for the problem but I can't figure out wether the reboot caused this issue or not. Anyone any ideas, any experience with this kind of problem? Thanks in advance!