This is the differences between 10.0.50 and 10.5 with the same project with opened mixer
10.5 needs more CPU power and its so unstable
Macmini 2018 i7, 32gb ram , latest Mojave
EDIT: well… ofter few days of researching for my problem , i found and isolate the issue . The problem is the graphic from macmini 2018 and my TV Samsung 4k … Only with Cubase 10.5 when i start play cpu goes high … when i open the mixer … its worst … everything going in red and cant play anymore …
when I significantly reduce the window size of cubase and mixer too, cpu back to normal … also ,with asus full hd monitor , works perfectly … My friend has 4k monitor and the same macmini2018 and he has no problem with CPU … so i can conclude that my problem is TV … Samsung TV 4k and Cubase 10.5 will not work together… Can you believe that ?