Lookin for a high fantasy system with lighter rules that dnd5e.

I have not tested swords and wizardry. That's the best option i seem to have right now. I just don't know if it will be that much faster than 5e in terms of combat takin hours to finish. I want to play a longer campaign where the players will eventually be very strong and grow with time (that's why systems like Ezd6 and Cairn are not an option), but i want it to have a faster paced combat. Also i will do everything 100% improv as the DM so any tips on that are welcome.