So since I am not the only one having troubles with that Drive I will show you something - the dear support ingeneurs are saying all alright, but I think it is a bad drive - I tested also others.
Lets start with my MP 600 42% and over 50% filling
Before
After
Now SanDisk Extreme pro nvme gen 3x4 1TB also
filling up more than 50%
Do you feel the difference? An SSD for gen 4 pcie is worse than a SSD for gen3! And it was not so cheap 200+ Euros vs 140
that is the answere from the support to this situation>
Quote - "Thank you for performing that test for us. After reviewing your results, we wanted to let you know this is to be expected. But the drive looks fine according to benchmarks. It's going to have less write speed than rated because it's getting closer to 50% filled."
What kind of a bad joke is that?