I did as you told and removed nearly all big and not nessesary items.
Its going faster now with rendering but i still have items like shelfs which are always rendered a bit wrong and a bit differently.
A few pictures of the rendering examples I uploaded. I tried different renders and options, but nothing is helping. I also used my work notebook which has a bit more power.
Rendering Pictures
Maybe you can have a look at that and give me an advise
Is it possible that you render my file one time for me and show me what is possible with a better hardware?
best regards
Michael