Don't worry UA; I've spent a lot of time tweaking and optimizing this mod (this is about a years' worth of work)... it has always been about optimization pretty much all the way.
The blood and gibs have a duration of 1 minute by default. Several A_CheckSight hacks are used to make sure the gameplay remains smooth.
I consider my mod to be one of the most forgiving "enhancement" WADs around. Trust me on that.