playstation

Hi everyone, while browsing some ps1 classics to play on my phone I decided to revisit some oldies from back when I was a little kid. I downloaded every playstation game I could remember but then I remembered one that currently has me scratching my head because for the life of me I simply cannot...

Most of the time it runs fine, 30fps for long periods, but everytime any kind of "dynamic lighting" kicks in, the performance goes DOWN, 10-15fps max. Did this issue occur even in real hardware? I've tested on both DuckStation and Mednafen's RetroArch core, and the problem persisted.