Edge and Chrome memory leak ? Memory usage 80-97%

Now i'm using windows 10 but I had this problem also when using windows 8.1pro.
The windows 81.pro I have the original dvd here and I tried few times to make clean install.
Also windows 10 I got it free online and the same problem.

For example now i'm using Edge I have two windows opened in one I have 10 tabs open and in the other I have like 20 tabs open. But the problem happen also with two windows and 6 tabs open in each one.

The problem is that once I start Edge or Chrome on windows 81.pro or windows 10 I see in Task Manager that the memory usage is about 60%. Then after some times without doing anything special the memory usage raise to 80-85% then ine many cases also to 96-97-98%.

Now and in most of the times I have in the background a game running in this case battlefield bad company 2 that take about 600-800MB of memory.
But it happen even if I close the game.

The only way to push the memory usage down is in the task manager to shut down the Edge/Chrome and all it's tabs.
Then to start the browser again.
I tested my pc with memtest I don't have any memory errors.
I don't have any blue screens. Can't figure out where is the problem.
My brother have like 10-15 years old pc then my one with 4GB ram and he can open like 20 tabs of chrome without a problem.

While the memory usage raise to 85-98% everything is running slow all the pc is slow almost freezing.

Before finding a fix I was wondering if there is a way to dig and find what cause the problem.
And also if there is any fix already i would like to know about since i couldn't find anything yet.