A problem for comps with live cams is that they are forced to the resolution of the comp size. I.eg create a compt with a res of 2400*600 and want to use one live feed usb stream on 800*600 it won't work. As soon as I drag the cam into the clip container Resolume forces the cam-resolution to the comp width of 2400*X. It would be really useful to adjust the Live-Feed resolution (not the scale!) of the camera via the clip-options.
A workaround for now is: Preparing the comp. Drag the camera on position where you want it. Don't scale the picture of the camera. Then before saving the comp change the resolution ofthe comp to the needed camera output i.eg. 800*600. Then reopen the comp. Now all cameras are forced to the right resolution, then change the resolution back your intended resolution i.eg. 2400*600. The cameras still will be at 800*600 and work smoothly.