What exactly is Heavy attack efficiency?

[(XBOX)R4ILGUN S]

I got a riven for redeemer and it came with negative Heavy attack efficiency, I use redeemer with corrupt charge for heavy attacks, does this negative stat worsen the damage or doesn't interfere at all?

[DrivaMain]

Heavy Attack efficiency influences how much the heavy attack consumes your combo counter. It usually starts at 0% efficency, which means it drains 100% of your combo counter. Corrupt Charge build usually are not disrupted by this.

[(PSN)Gentleman_Raven_]

Combo Efficiency

While heavy attacks consume all of the combo counter by default, the Combo Efficiency stat preserves a flat percentage of this amount. For example, a +40% Melee Combo Efficiency retains 40% of the combo counter, with 60% consumed instead of 100%. The cap for Melee Combo Efficiency is 90%, leaving a minimum 10% heavy attack cost. Sources of Combo Efficiency include Mods, such as  Focus Energy, and the  Zenurik Way of Inner Might.

A heavy attack always resets the combo timer regardless of the amount consumed or whether an enemy is struck. When enemies are unreachable, and with the help of Combo Efficiency, players may stretch their combo duration by employing the heavy attack as a combo refresher. Combo Duration Mods like  Body Count can further extend combo duration between combo refreshers.

[Famecans]

after performing the heavy attack the combo points are drained, similar to stamina.

more efficiency of heavy attacks = less stamina drain :v