Can't play Teenage Mutant NInja Turtles with same settings as my friend

[AncientCarthage]

Me and my friend wanted to play Teenage Mutant Ninja Turtles over netplay, but we discovered the game lags significantly when I run it. What's especially bizarre is that we use the exact same settings with no deviation, yet my friend runs the game perfectly whereas I experience significant lag whenever I try to run it. We've wiped the emulator and all the settings for it on my computer and reinstalled everything to no effect. Please note we have to have dual core disabled for netplay.