There's no more overworld. At a town, you have a small selection of locations in the form of a list you can scroll through, from Pokémon Center, shop, or gym. Selecting the Pokémon Center gives you the notification that your Pokémon are healed. No needing to waste time with a "cutscene". Selecting a gym gives you a list of 2 trainers, and the gym leader.
Once you've beaten the gym leader, you have another selection of items in the form of a list for the towns you can visit. The gym leader doesn't waste your time with dialogue, and there's no "cutscene" for getting a TM, you just get a notification that it's been added to your inventory. No wasting time wandering around a route, you have a list of towns that you "access" as if you had fly, and go to the next town with another list of Pokémon center, shop, and gym.
Another QOL feature is adding a timer in the corner to keep track of speedruns, and the option to gain no EXP and do a level 1 run, with opponent levels scaled appropriately.
