Service: WindowServer consume whole memory.

Thank you for the Activity Monitor image above

But what else is running in Activity Monitor

What appears in your image is only a snap shot of some running Applications /Services

Suggest using Activity Monitor >> View >> View ALL Processes

Example, am running Safari ( NO additional Tabs ) , Notes, Mail and Activity Monitor

Thank you for the above

Often times - the issue maybe not actually be a single process alone but a combination of Processes

From what is presented, there are 7 instances of Google Chrome and associated process running including the

" Renderer " and " Helper " processes

If you look at the Memory Used in each of the above mentioned processes it ranges from the low of 426 MB and gets t progressively greater in each other process.

Then there is the question of the number of Open Tabs in your Browser, they can also affect Memory Usage.

Seems the solution maybe:

1 - use a less Memory intensive Browser like Google Chrome

2- Limit the number of instances of Google Chrome from running

3 - Limit the number of Open Tab in Chrome

Welcome

Good work there 👍