Would you be kind enough to reinstall the previous version and check if the rendering really runs faster?

OK, TY for the link.
But this was not the good question.[:D]
I never said that renderings had lower speed, only that the PC had entirely lower reaction.

so I installed version 6.1a again.



First observation: the amount of total RAM used is different and upper in the same situations.

Second: The given results of the RAM are different (with the same project during renderings) !

Third: Task manager said that the processor occupies only 92% instead of 100% with the other versions 6.2 and 6.3 .

Conclusion: A 8% difference is huge for a processor ...
I see and only report facts!
Something changed and weighed down sh3d 6.2 & 6.3 [:((]
What are new added functions (in 6.2 & 6.3) which give lower reactions ?

=> Can you see for yourself the problem ?
=> Can you give us the options to activate or not these functions?
.