After defeating Magma Dragoon and entering the 2nd part of the intro stage, the game just slowed down to 10 -15 fps! I hope this information helps!
Viewing post in MEGAMAN X4 K.B. DEMO_0.2 (02/18/24) comments
I tried investigating the issues related to the game engine, and perhaps the solutions discussed in the following link may help you:
https://steamcommunity.com/app/837510/discussions/0/1643167006296337288/