I just checked and it looks like the update to build Win10 1809 wiped out the registry key for me. That might explain why Cubase 10 seems smoother/more responsive than 9.5 has recently. I wonder if Microsoft also changed MMCSS behavior in 1809 as it was much worse before? Fabio, any chance you can get into a little more technical detail about what Cubase 10 is doing differently with MMCSS now?