When I got this monitor (Acer Predator XB241H) three days ago, I immediately set it to 144Hz. It has worked fine for browsing and gaming (it's been brilliant), but when I'm browsing now, it seems a lot less smooth. I decided to do this online refresh rate test (https://www.testufo.com/) and it said that my display is running at 60hz. It is set to 144Hz everywhere: In Windows and in NVIDIA control panel. What can I do? It was running perfectly smooth even this morning, and now it seems to scroll more like my 60Hz display in Firefox. It is now the same story in Discord: It seems to scroll a lot less smoothly than it did previously. I'm really unsure about what to do.
It also seems to run fine in games. In Rocket League, I had it set to Borderless Window and it seemed to be jittering a lot. I then changed it to fullscreen with improvements. But I was not seeing these problems a couple days ago.
I appreciate the help, thanks a lot! If you need any more details, please let me know.
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Try using Firefox instead of Edge. Mine did the same thing, but when I tried it on Firefox it read 144hz fine.
I am using Firefox and I was when the monitor was working. Now it still seems jittery.