## Description
The proof tree rendering slows down for medium sized proof trees.
## Reproducible
always
### Steps to reproduce
> What is your expected behavior and what was the actual behavior?
### Additional information
Problem is the tooltip rendering removing it resolves the problem, but we loose any nice proof tree label rendering, so a better solution is needed.
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* Commit:
It seems that the tooltips on the proof tree (I assume the problem is about them) cannot be switched off at all. Would be nice if there was a tick box in the local menu to get rid of them tempoprarily ...
@unp1