I don't have any problems if I use the Showtec Active Sunstrips, so if you could make the same adjustmenst in visualisation for the Vellemans as you did for the Showtecs I recon the performance drops would be completely cleared. Simulation of the light itself is of course not the same, but I prefer good performance :)
I currently reworked my show file with the showtecs, but their dimensions and weight is not the same as the Velleman/HQ Power's so it would be awesome if these could be adjusted for the next version of capture as well :)