Axelay FastROM
アクスレイ
Switches Axelay to the SNES's faster ROM access mode, which removes most of the shooter's slowdown.
What it does
Axelay, like many early Super NES games, reads its code and data in the console's slower ROM mode. Vitor Vilela's Project FastROM rewrites the game to run in FastROM mode, in which the CPU reads from the cartridge about a third faster. In practice most of Axelay's slowdown disappears; it can still show up when the screen fills with particles, such as during boss explosions.
The same project covers Super Castlevania IV, F-Zero and U.N. Squadron with separate patches. Version 1.41 extends the optimisation to the routines that decompress the game's data, for a very small gain on loading screens.
Playing it
The Axelay patch is made for the American release. Apply it to your own copy following the instructions on the project's GitHub page. Credit to Vitor Vilela and the testers he thanks there.