Geant4 becomes slow

Hi all,

I installed geant4 on Ubuntu and works fine. After updating Ubuntu geant4 becomes very slow. Do you know why? I appreciate your help. Thanks.

Best regards

When you say update, do you mean the whole OS e.g. 19.10 -> 20.04, or a normal apt update && apt upgrade?

I restarted my computer and it works fineā€¦Thanks for your reply.