I wonder how easy it would be to introduce a speed/tick system into dnd, or other d20 fantasy RPG, something OSR maybe, probably easier with a simpler system (or at least more structured) than current dnd
edit: hell maybe something not d20, I mean some sort of classic fantasy dungeon game
still probably not super easy, would screw with the action economy unless you're careful
I mean like the system in Exalted 2e
actions have a speed rating, that's how long the action takes in ticks, a "round" is 10 ticks long (usually represented by a tick wheel), weapons have a speed rating, attacks with weapons take that weapon's speed
so at the start of combat, everyone rolls initiative (Join Battle in ex2), determining on what tick of the first round they act, on your turn, you do what you're going to do, then you add up how many ticks that took,
you act again after that many ticks have passed (moving around the tick wheel)
if that means you act more than once in a round, then that's what you do
people acting on the same tick, act simultaneously
I honestly can't remember how EX2 handled multi-attacks (at least as far as speed goes), but I know it had them
you would need speeds for different types of action, or at least like movement, attacks with different weapons, spellcasting, and guidance on miscellaneous other actions for GM adjudication
