Ya, you'll certainly have to be careful with looting speed in fast spawns and keep your rules list reasonable sized. However, think about how long it might take you to do it by hand. So 8-10 seconds is pretty reasonable and can let you focus on the fight and less on the loot.
I've already optimized the crud out of it. If you dive in and look at the code, you'll see what I'm talking about. This looter is actually the next generation looter. For those who used my last looter, you'll know this one is probably 5x faster. I've pretty much squeeze as much performance out of EUO as I can. You can certainly skip features to get performance, but it's the features that make this looter so cool.
There are a couple optimizations I've included in the FULL version of the CLAw, but that's reserved for the Elites here. Those optimizations do shave a couple seconds off the loot time, especially if the corpse has a bunch of junk in it like regs, scrolls, etc.
Goto the "Stats" tab, and report the timing statistics for RET, RPC, AvgRPC and RPS so we can see how many rules per container(RPC) and what your rules per second (RPS) speeds are. Also you'll see the rule evaluation time (RET)
One other thing is that your own CPU makes a big difference so if you have an older system, you might not get as much looting speed (points at _C2_) :p