Like any electrical component, a CPU generates heat when it is being used.
It is possible to overwhelm a cooler though.
While it may seem annoying, its actually a protective measure put in place to keep it from breaking.
A CPU can be damaged by running at too high a temperature.
To prevent this, CPU manufacturers have implemented the process of thermal throttling.
Different CPUs have different values for TJMax.
Staying this far under the maximum allowed temperature reduces the risk of temperature-related damage.
What to do if a computer uses thermal throttling?
If your machine is thermal throttling, then something is wrong.
It could be as simple as your cooler not being powerful enough.
It does mean that you oughta change something, but you have time to do so safely.
confirm you keep your work and power your box down, then carefully examine it for problems.
If you cant determine the exact problem, take your gear to a technician for diagnosis.