Low Performance of PC (slow PC)
There are many reason for low performance of PC. You can do some checking by yourself to find out (for Windows users), this will help us evaluate the problem:
Open Task Manager to check there are any process eating the PC resource. That maybe CPU usage, RAM usage or Disk I/O is very high.
Very high temperature of CPU may cause the problem. You can check the temperature by touch to the right of the PC case or use some free software as Speccy64.
Check the free disk space of the Partition that you have installed the OS. Low disk space of this Partition may cause the problem.
Those are some basic ways for you to check by yourself first, then request support from IT.