Would someone mind combining the topics linked in the first post?
I've completed stage 1 of a new run. This is about as frame perfect as I was able to manage, including some pretty substantial lag management at the bosses.
http://www.youtube.com/watch?v=JIcn6-7wJ4Y
(SNES9x 1.43)
http://dehacked.2y.net/microstorage.php/info/636169749/Stage%202%20scene.smv
I am about 21 seconds ahead of Pavocado's run. I am also 1677 frames = 27.95 seconds ahead of OmnipotentEntity's run. Comparing to OmnipotentEntity's run, ~642 = 10.7 seconds of those frames were not gained in boss fights. 5 seconds or more can be attributed to a new trick we've been calling "pogo jumping" which created a new route, but frames were saved in every single room due to sliding optimization.
AniMeowzerz helped with the route early on and pointed out the trick to slash to start the sliding animation earlier upon landing. Coolkid found the pogo jumping trick. I've developed a fairly lengthy script to observe positions and velocities, if anyone is interested, PM me.
There will be two deaths utilized in the run in levels 3 and 5. A death in level 1 is possible to save around 10 frames, but we do not have a third life to spare. Pogo jumping can be utilized to perform the level 2 midboss skip, saving significant time (and making it reasonable on console). A major skip is in store for stage 4, but I won't reveal it at this time. Currently I should have maximum star power available at the point when the spin is received in stage 5 due to the stars gained from deaths, so I am not worried about stars until then.
EDIT: Some random pieces of information. In mid-air your speed is only effected every other frame by a direction. This means you can turn around for camera manipulation. This has been used in a couple places to save frames on enemies spawning, and has future uses as well. When you stab your sword into the ground, it will only "plink" against the ground every 3 frames. This leads to a 3 frame rule in some cases when needing to pogo jump. I saved 3 more frames by facing the opposite direction while grabbing the level 1 powerup. They hexed right in. I'm not going to repost the level 1 video.