Outside of combat, while there are no enemies nearby™, opening portals should happen immediately (like in PoE1).
It’s a totally minor thing, but something that actually icks me. Many portal MTX have satisfying opening animations (e.g. all portals that appear with a small “boom” explosion animation like the Sacred Wisp portal) that feels A LOT better when being shown immediately. In PoE1, opening portals doesn’t have the casting animation delay where there character does something for 2 seconds before the actual portal MTX appears. That’s so much more pleasing to me, because pressing the “open portal” key immediately plays the boom explosion animation.
For gameplay reasons, this should obviously only be the case while there are no enemies nearby and while the player isn’t in a combat.