It's a highly compressed keyframe based format, and it's not recommended to use with Resolume.
It's being decoding on the CPU, so playing multiple 4k mp4 files at once can have a big hit on your CPU usage for example.
Because of it's design, anything else than nominal speed forwards playback will cause issues. A specific frame can only be decoded by seeking to the nearest keyframe and decoding all intermediate frames. You'd expect that to be instant, but actually it will need a lot of work from the CPU.
We recommend to use DXV encoded video clips with uncompressed audio for best performance. DXV is all keyframe, and can be decoded on the GPU, taking the load off your CPU.
You can use Alley, our free encoder and player to convert supported media formats to DXV.
Alley is bundled with Resolume 6 and up, but you can also get it as a standalone installer from our <a href="
http://resolume.com/download">download</a> page.
Resolume installers also install a plugin for Quicktime, and Adobe products so DXV should also show up as an option in the Quicktime formats, or stand alone in the Format list - depending on which converter you use.
Why are you still on 5.0.0? The latest 5 release is 5.1.4.