I am in Windows 10, and I am running Edge browser. Have nothing blocked. Turned off all ad blockers (ad block plus and ad fender), allow max storage, allow all cookies.
I have times when my meter is jittery as all get out. I think this is more due to the "game machine" than a browser. For example, if I am one putting, whether a birdie or a par save, everything. Then I two putt a hole. My meter on the next couple holes is ragged at best. If I hit these holes well then my meter smooths and I move on. If I hit them poorly then my meter still smooths out, but it seems as though I am locked into a 2 putt rest of the round.
With some balls, Callaway especially, it seems as though when the hits meter turns red the meter gets jittery.
I do agree with Fencer fully. Find a browser and stick with it. It is hard to recommend a good browser without knowing what your PC setup is.