The idle CPU usage should be around 1% to 5% in most of the cases. To check this, close all the opened programs and then open your task manager and check your Idle CPU usage. Make sure that you don’t have any services or processes running in the background having high CPU usage. Here are various causes with their solutions that can help you to fix very high or 100% CPU usage in games.

In games, you can monitor the CPU usage using the MSI Afterburner software, and in Windows, you can do it by using the Task Manager, or if you want to get into more detail then you can use a great third-party utility, which is Process Explorer. So, here I am going to list down the major causes of high CPU usage, along with their solutions. High CPU usage in games when you have a weaker or older processor is pretty much understandable especially when playing a CPU intensive game, but if you have a modern-day powerful processor with many cores (more than four), and then also getting 100% or high CPU usage then the problem lies in other areas.

Why does firefox use so much cpu