Great watch, but slow.

I’m satisfied with my watch, but for the last half year it has been slow. When I push the buttons, I can’t usually count up to 8 seconds, before anything happens. Scrolling through menus sometimes works, but not without delays.
This also occurs when starting an activity.

I have restarted, deleted watchfaces and apps and so on, but nothing seems to help.

I’m running the latest software.