When I mine any coin in Winminer the computer behave well and I only mine with graphic cards not with processor so the processor is 100% mine to use for other tasks but when I mine only Sumocoin the computer almost becomes unresponsive. It is strange that only mining the most profitable coin I have this kind of behavior. I wonder what can be the cause.
Winminer is just a graphical shell that allows you to run "real" miners (Claymore, etc.) and display statistics in a convenient form. You need to check which settings use the miner (intensity possible). Miners are in the folder of Winniner - AppData/Miners.