Sure I could use a second machine but in my clubs often there isn't enough space to set up two machines (bar table 80x80cm etc.)
Performancewise I wouldn't load too many stuff aka a whole VJ set in R5 alongside R6 as I can't play live in two apps anyway (switching windows, no way). It's just about loading my beloved old flash content and using text animations with FFGL plugins that haven't been ported to 64bit yet.. Anyway I guess my computer would still run two instances of Resolume without sweating too much (R5 only uses 3GB Ram, not too big composition, good experiences running vvvv besides R etc..)
it would be great if arena.exe would just be re-named into arena5.exe and arena6.exe. Or maybe Resolume 2.41 with Spout output. Shouldn't be impossible