Windows 10: CPU Usage 100%, Goes Down when opening task manager.

I have been having the problem of my CPU being at 100% usage when Opening task manager, But after 1 second or less it goes back down to regular levels. 8%-20%. I am on a laptop, My specs are; An i7-8750h, I have a 1050ti 4GB. I am running 12 gb's of ram. This problem occurs Everytime when opening task manager. I have not noticed this problem occur before because I was not paying attention to the usage.

:)

 

CPU at 100% that goes away when opening Task Manager

Thanks for your answer @Jay#222. I understand that a computer is doing a lot in the background. In that case above, I was using Adobe Lightroom which is heavy on the CPU but I might get this when I'm just using Google Chrome googling things. Its weird to
me because upon opening the Task Manager, my CPU calms down when it might have been working hard for quite some time. My CPU might be working hard for 10 minutes and then upon opening Task Manager, it calms down. I'm sure if it listed the CPU usage prior to
opening the Task Manager, it would be 90%-100% usage all prior. Is it something like the Task Manager flushes processes and that's why it drop significantly? And I mean it drops to the point where the fan will calm down and my laptop will not lag much.

 

Cpu usage high until I open task manager

So, whenever I open my task manager CPU usage is at 100% and thing that takes up 100% is something called " system interrupts ", but its only when I open the task manager, so when my task manager is closed my CPU usage is at 100% at all the times? Do
I need to keep my task manager open to play games?...

 

High CPU Usage from Task Manager, Then CPU Usage Goes Down Very Fast

I am noticing that whenever I open task manager the Task Manager process is using 15 - 20% of CPU, but then it quickly goes down to less then 1% CPU Usage.

Also my fans randomly speed up, and whenever I open task manager the CPU Usage of task manager goes down and the fans start to slow down, but when I close task manager the fans start back up again.