Yep. It is.
Good to hear from you again. Are you gonna be at NAMM? If yes, I’ll swing by the booth to say hi. I’ll be performing at the Yamaha Grand Plaza Stage on Sunday, most likely with Gig Performer 
Last Q: should I expect a performance hit installing Mojave, or will it be pretty much the same?
Yes, I’ll be there. As for performance hit, not from Gig Performer’s perspective, but always check your plugins in plenty of time before a show to make sure there’s no impact if you’ve done a recent update