What is up with on release quick cast?

So i pretty much enabled regular quick cast as soon as i got into this game during beta and ive played like that ever since.
Now im trying to get into the On Release version of quickcast to make a few certain character abilities hit a bit more reliably.
Problem is when its enabled the game feels like it has a major input lag. The abilties activate after releasing as meant but movement, attack move and generaly character click attacks are REALLY sluggish.
Somehow trying to manouver with the On Release enabled is a major drag and i struggle to move and attack like before.
As soon as i turn it back to just regular quick cast everything feels normal.

Is it meant to turn absolutelly everything like attack move commands into an on release or could i experience input lag.

Go into graphics settings in-game and disable Vsync

Go into your video driver and do the same

Now try doing the same within the game