Hi
I just downloaded the JP8 V the other day and have a number of issues with it.
As other posts confirm the CPU usage is ridiculous. A pad with a bit of release instantly pushes the CPU % way up over 50% on my system (Athlon 3800+, 2GB RAM, XP SP3).
It also seems quite buggy. I've had more crashes in the last 2 days than I've had with all the other Arturia synths I own (MM V2, ARP 2600 V2, CS80 V2) put together.
If it doesn't get any better I'm going to ask to swap the JP8 for the Prophet 5 instead. I paid good money and I want a synth that works well.
Your other synths are brilliant Arturia, but the JP8 needs some work to make it usable.
Anyway, that's my 2'pence worth
SJS