This thread might help you: https://community.troikatronix...
Especially @DusX comment about load: "LOAD is a measure of how much time is being used to process each frame, based on the target frame rate. It is NOT a measure of your system resource usage. In Isadora it is most important to know if the scene can process at the selected framerate, LOAD provides that, a measure of 100% means that calculating/rendering the frame is taking all the time available between each frames delivery. This will lead to dropped frames."
On my system, the load is often above 100% and it doesn't create a problem until it gets up to 10 times that!
Cheers,
Hugh