at times with heavy workload, my devs tell me they receive a lot of database timeouts. A the database I got 2 stored procs which get heavily executed. If I run the queries at ssms they take about 1000 ms. The execution plan looks good. But the cpu goes up to 100% and I got a lot of SOS_SCHEDULER_YIELDS. I've allready gone through all the points of chapter 3 in the book "the accidental dba", but none of the reasosn fit. Why is the query so ressource intensive?