It takes me at least 15 minutes to resolve a 5 party combat round in SW. There is the card drawing (and re-drawing for those PCs with Cool head and Quick edges etc) the effects of Jokers when drawn, PC's deciding what to do with their 3 actions when their turn comes up, calculating TN's via MAP (mutiaction penalty), range, wounds, recoil, snapfire and other effects, rolling and adding exploding die for each action (possibly multiple times) then rolling exploding damage die (and adding them up) for each attack that actually hit, doing the [damage -(toughness+[AP-AV])]/4 calculation, and then possibly rolling an exploding Soak test to reduce that damage (without forgetting Bennie re-rolls).
In 5E its a single initiative roll, then each turn comprises of a [Move]+[Action]+[possible bonus action]. Actions are resolved via a single d20 roll (either an attack roll or forcing a save), with a possible damage roll to follow.
Even mid tier 5e rounds take a few minutes to resolve at most.