The Basics

Make sure to turn "short replays" off in the options.

Mash circle after the final point to skip the replay that always happens at the end of the match.

	I tested turning autosave off and it doesn't seem to be any faster because you have to go through a few prompts for saving if it's off. Autosaving only takes a second or two usually so I think it's faster to just leave it on. If you were really fast at doing inputs in those prompts it might save some seconds over autosaving throughout the run.

	Character choice seems to be mostly just preference. Higher tier characters have better stats but worse timings on their shots. I prefer net characters because aggressive net play seems to be the fastest way to score points. I play Kaito for most of the run because he's a net character, has lenient timings, a strong curve on his circle shots, and a wide reach.
	Every character is a bit different on their shot timings, especially expert characters, so getting used to them is important. Lola, for example, has an amazing circle serve when you get the double note but the timing is so strict that you would have to be very consistent for it to be worth using her. I suspect expert characters are the fastest to use because of their stats but their timings would take a lot of consistency to be useful.

For the courts, I just use the default court usually because changing it takes time. I suspect grass courts are the easiest to score points on because of the low bounce and higher speed retention of the ball. I'm not sure if changing the court to grass when that's available is actually faster or not.