Alteryx freezes randomly when selecting tools

[Squall]

This problem has been driving me crazy.

My Altery Designer stops responding for about 10 seconds when selecting an existing Formula tool. It does it randomly, sometimes I'd select the very same tool without any freeze. When it freezes I notice it is writing a .tmp file in the temporary but nothing else. The .log are not useful because it happens outside a run...

I have tried many things, including rebooting my PC and playing with the User Settings below. Nothing works.

Please help !

[npariso]

Bump. I have also noticed a decrease in performance lately.