Very slow direct offline processing with 2 plugins, changing parameter of 1st

Cubase
,
1

I use clips of 30-60Sec.
I set up

  1. TIME.STRETCH to stretch material to aprox 70%
  2. NORMALIZE -23 LUFS

When I change the 1st slot “TIME STRETCHING” a bit, it takes surprisingly veeeeery long to finish.