Checkmk 2.0 extremely slow

[andreas-doehler (Andreas)]

@bitwiz

Once I shut off performance data processing, everything works just fine, about 500 service checks per second. As soon as I re-enable it, everything slows to a crawl

This is expected from my side.
The reason is you symlink to /dev/null for the performance data folder.
It tries to access these files for every check or tries to read the files for every GUI refresh.