MainUI Rules View very slow


Does somebody else have the problem that the rules in the MainUI are very slow in showing.
I just can click once on a rule in the loaded list. Then it is so slow that the browser is saying “not responding”.
All other views are fine.
There are about 150 rule, must of them file-based loaded.
OH is running on docker instance with i3 and 16gb ram.

Related -

Apparent circumvention - load DSL rules from xxx.rules files for now, OH2 style.

Not really,
My CPU load is low (25% for OH). Just the rules list is very unresponsive.