This has been known for a while, but I'm posting it here just for anyone to see. When you save reset you clear the first firebar sooner but have to wait for the 2nd firebar anyway. Without save resetting you wait on the first one but catch the same cycle on the 2nd firebar, essentially gaining time by not save resetting. Saves 0.9 to 1 second.

Saves 0.6 seconds over the save reset if you get first frame reset which means usually it saves a bit more (around 0.7-0.8). Also, you can shoot the save as you jump up, so this strat does not completely end the run