tl;dr - it is faster to soft reset after finishing a map and saving than to watch the flashing cutscene.
more - after you defeat DK on the last level of a map, you're prompted to save, then the map flashes for a few seconds, then the new map appears. Originally suggested by whatisevenanything, it appeared to be faster to reset after saving rather than watching (he thought it had to be a hard reset, and thought it would be emu only).
See:
I considered soft reset, and decided to test it on both GBi and SGB2. Turns out, it's faster on both.
See:
How much faster? Approximately 2 seconds faster on emu and GBi, and approximately 1 second faster on SGB2 (due to the SGB enhancement packets causing lag). This is for every map transition, so it adds up over the course of an entire run to a decent amount of time save.
This is not a major glitch, it is good to use.
This has been known for years otherwise it's still a nice thread.
Link:
My first statement was poorly phrased, let me rephrase it, our own ignorance doesn't change the fact that this has been done in the past but i thought this was still a nice thread because it's just logical how multiple people will find the same strat and everytime awareness is spread about it it's a good thing. If i could redo my statement and make it more clear from the start, i would because in retrospective i can see how it was a dumb thing to say.