Not advising you what to do but some people seem to think that the world updates (excluding USA for some strange reason) are currently adversely affecting sim performance. Your mileage might vary. There are probably plenty of other simers who are experiencing no issues with them.
I’ve myself have uninstalled all world updates and seem to get much better performance. Fps on my nearly 5 year old PC system is now mostly averaging 60 or more with high sim settings in payware GA (no live weather, ai traffic at 10%, no multiplayer, only 2 to 3 updated addons in Community Folder)
Nothing to stop you installing and then uninstalling WUs of course if you do have issues but I just thought I would mention my experience FWIW 