The CPU running at 100% is not bad for your system. It may even be normal for your system if it does this under load (like gaming). The only thing you really need to worry about as far as the longevity of your system is the temperature (internal temperatures).

Apr 11, 2010 Fix High CPU Usage in Games [95% to 100% CPU Usage] Feb 19, 2020 Is 100% CPU usage harmful while gaming? - Quora Mar 14, 2017

Oct 05, 2019

running cpu at 100% good or bad? - Mac - Computing.Net

Battlefield 5 100% cpu usage bad fps stability - Page 4

You can also check high CPU usage by going to task manager in the performance tab. Luckily, there are ways using which you can fix CPU usage 100 percent or high CPU usage problem. There are some culprit processes and threads which you have to get rid of. There are some other tricks to fix increasing CPU usage in Windows. If the sum of the read/write speed exceeds than 100-150mbps then 100% disk usage occur. How to Detect 100% Disk Usage. 100% disk usage is very annoying as it slows down the speed of the PC. You need to detect it and fix it as soon as possible or it might crash your PC in severe stage. Here’s the way to detect 100% disk usage: For a dual core cpu I would expect about 100 cpu usage while doing such a thing as described to you as above. And with a Cpu that contains more physical cores such as 4,6, or 8. A much lower cpu utilization percent because the work of running a game and capturing the game play of it in real time would be spread across each of the amount of CPU