Hello,
when i load my project, it's 10min of loading with only 12% CPU usage.
it's a win10pro + 24go ram+ I7 8700 with a not that huge file.

Any ideas why only 12,5% ? it's super strange

Greetings
Fred

It's running single threaded while loading in the nodes, using 1 core of your 8 logical cores (1/8 = 12.5%).

It's possible to use multi-thread to load the file, I'm facing the same problem with loading a big project takes a long time.