if anyone of the ppl having this issue wants to I could make a team viewer session install a profiler and look at what is happening live. I got no more ideas on what could be tried. So looking at the problem live is the only thing I can still imagine could work.
I might like to:
reinstall the client
install programms like Intelij(IDE for programming) , yourkit (java profiler) and microsoft process monitor
Personal message me if you like to help and schedule a date with me.