DPS Multiplier for this skill

Hi there, I have this build which is from a friend and I saw a 3x dps multiplier on a skill like in the image above. On my build I can't take that, I'm trying for at least 1h to figure out where it comes from and still no clue. Maybe someone can explain?

PS: I must say all skills and items are the same, quality, level, enchants.

Regards,
Daniel.

Just guessing:

Id assume he set Blade Flurry to be released at 6 stages and you didnt.

According to wiki:
For example, at gem level 20, with "perfect channeling," as of patch 2.6:
{0.6392156862745098,0.5529411764705883,0.42745098039215684}DamagePerSecond=0.5464\times 1.6\times 2\times 1.85=3.33888

Bolded part is impotant, which PoB would round down to 3

you are a genius :D thank you

Welcome :)