Kill speed is a factor based on more runs which improve chances of items to drop.

My bowazons normally have a max of 100% before diminishing returns, that is because surviving and speed produces better results.

200% is still decent as long as you can kill fast and survive.

Build dependent of course, and since you are using a Frenzy barb, you also have the option of Find Item skill to Horck bods for more drops etc.

Good luck and have fun.

Sorry other questions:
Mf of merch is added to mf of me?
Mf of the secondary equip is counted if i kill with the first equip?

It is.

It is if you equipped it before kill. Can't kill then switcharoo. That won't work. It's like the horizontal dance and put on the the rain frock later. That doesn't work ether.

Or, mf of merch is added to mf of you or the other way around, if he or she makes the kill. That is, the merch. You know what i mean. You don't get his or hers, but he or she get yours. Whatever you are.

Exists a site where i can find explanation of "mechanical" of d2?
I mean for example how work crushing blow, deadly strike, mf, which are max stats possible of grand medium and small charm, ias working and so on?
I found only some of these info in maxroll or tome of d2

Thank you again

there is no limit..
i like to have 200 on nonsorc class

Thank you. Source ?

And what about the question if exists a website whit the explanation i asked?

You don't need a website my son. You need me. I can answer any question.

But arreat summt is a god place to start. But i can't actually find anything about crushign blow there. I guess you must seach elsewhere for that.

But cb lowers enemy current hit point hp by 1/4 melee, 1/8 ranged, even bosses. So it's a powerful one. Use it good. But obviously quite wasted on the low hp enemy. But i'ts a good boss killer. Using upgraded hone sundan, with jab, or fury wolf, and guilliaumes helmet, now you'r eclosing in on 100% cb .. it's crazy. Enemies take huge damage now. You're golden.

Thank you taurean, but I would like to read for myself aviding to disturb each one for everything xD.
I will start from arreat summit for the rest of questions.