FastROM removes the majority of slowdown present. Normally slowdown still appears during boss or axelay destruction which a lot of particles appear.
This version is compatible with the NTSC-US version of the game.
Click here for the main GitHub project page.
Hashes:
Database match: Axelay (USA)
Staff/Credits:
VitorVilela7 for the Overall Project.
Relevant link: https://github.com/VitorVilela7/fastrom
File download: