Roon is a fairly resource intensive application and one that might struggle if your hardware is under stress of the applications especially roon. Certain functions in roon will cause systems not up to spec to suffer and possibly have issues. Importing of music and audio analysis are the primary ones when new libraries are being created.
Thee are many here who will help. Sometimes it just a matter of riding out initial system performance hits based on what is not a perfect fit for the hardware you have spec wise.
@Claus_Blem Starting a new thread with specific system details and problems encountered is your best bet and as noted to Flag support.
See here I'm having a problem with Roon -- where do I report it?