Hi
This has been an issue since R6 came out, yet I had hoped it would be solved over the following releases of Resolume, especially as many people seem to have this issue. The frame rate of my old XPS15 (with Nvidia gtx750) was going low as soon as an external projector is connected.
Now I got a new laptop, the latest XPS15 with a AMD Radeon Vega GPU, no more Nvidia mess, and guess what - the problem is even way worse! For a 3840x1080 composition, two HDMI outputs (and several DXV clips played), it runs stable around 60fps without any output connected. It roughly remains the same when connected to my studio monitors.
Yet, turning up at a venue yesterday, connecting to two projectors, framerate goes down to crazy 9-11fps!! With only one projector connected it was around 20-24fps.
You will understand that this is a massive problem! Spending that much money (for the Resolume license and for a new laptop, essentially bought for this) and all I get is a broken ~10fps playback solution. This is _very_ frustrating.
Trying out various output framerates (59Hz, 60Hz, 30Hz interlaced..) had only very minimal effect on R6's framerate. Same for all tries with colour spaces, reducing resolution of main laptop window, reduction to FullHD composition size, different Radeon settings etc. etc..
Btw, during all of this the laptop doesn't even break a sweat. CPU is at 10%, GPU around 30%, SSD at 5% .. so that is not the bottle neck.
Out of desperation I started Resolume5 and here comes the surprise: it ran stable at 90fps (with a single fullHD composition).
So, long story short, this needs to be fixed as soon as possible! It renders R6 useless, especially for bigger setups.