Sometimes my computer seems to be very slow and unresponsive. What is the first thing you do to figure out what is wrong?
The first thing is to start the Task Manager. Right click on task bar. OR Ctrl+Alt+Del.
Then start to look at Processes, It will show the CPU, memory, disk, and network utilization. I always sort the list initially by CPU usage.
This can point to the program that may be "sucking" as you technically say to the problem. If you see a program that you don't recognize you can look it up on the internet to see if there are some know issues. Programs using more that 25% of the system for extended periods are usually a problem. You can cancel a program but that might create other problems.
The task Manager is your first line of offense to isolate problems on your Windows PC. Ken are you happy that you gave away one of my best secrets?