Yeah, there's painfully long delays on all of the "instant" cast abilities that tend to really count. I've died while popping HG, being lustrated/bene'd, and missed a couple silences when hitting Spirits. While the last it can be argued is easily avoidable, cast bar at 50% for High Voltage, but due to a touch of lag and a touch of "wait for your instant action to take effect" it landed after the last 50% charged.

Somewhere in my head I got this, apparently misguided, impression that instant meant now. Perhaps one day this will be true again.