Enfold + compression options = slowing page !

FYI,
I have detected an odd problem with Enfold:
– WP just installed, not plugins at all
– Enfold uploaded
– When I activate Enfold, public website speed goes as down as hell (10 seconds for first 200 response in any link). If I swap to WP default themes, public site goes extremely quick again (obviously, good server and empty site).
– When I reactivate Enfold BUT deactivate CSS and JS file mergin and compression options, public website goes quick again. Almost as quick as using twenty twenty.

… I think mergin options should work inverse of that :)

Environment data:
– BBDD Maria Db 10.1
– WP 5.5.3
– Enfold august 2020 version
– Website not published (dns not set public, using windows hosts archive mod for working on it)