OH2 starting very slow, how to delay rules loading at startup?

OH2 starting very slow, how to delay rules loading at startup?
I have large items file and many rules files.

I think of linux based decision - may be turn off “read access” to rules folder until OH2 starts?
Im not familiar to linux scripts at all, may be someone tell me is it possible?

A trigger may be item that restores value from db, if that item changed to “ok, im ready” then turn on read access to rules.

Script will access to that item through REST API.