OK, I’m lying, I’ve only been upvoting.
But I click on something to upvote, the click registers, but then does not complete and the counter resets to what it was before I clicked.
I also notice very slow posting of things like this, or comments on existing posts. I’ve got a modern computer and gigabit fiber.
Yup, exactly this. The lemmy devs are working hard to improve the app to handle all the new users but for now things will be a bit slow :)