Hi Alex,
Yes, it's the Task Manager. When things bog down, I generally click on the Processes tab, and then on either CPU or Mem Usage columns to see who is using more than their share.
You can select what you want to look at by using the View>Select Columns... menu command. My columns are set to PID, User Name, CPU. Mem Usave, Base Pri, GDI Objects, IO Reads, and IO Writes.