kageroushinobi: I'm still getting massive framerate drops in Hardware mode whenever someone uses Stealth Camouflage (for instance, when Grey Fox shows up in the cutscene just after beating the Revolver Ocelot boss fight).

Also, boss fights after Revolver Ocelot are still playing the incorrect music (they play Encounter when they should be playing Duel). Duel correctly plays during the Ocelot boss fight.

Finally, when using analog triggers (such as the Xbox One controller's), the mappings for the Item and Weapon inventories are reversed for some reason.

JNolan1993: It's weird, the same massive framerate drops happen when playing the PS1 version of Metal Gear Solid as well, using the PS1 emulator Beetle PSX HW on Retroarch. How can modern PCs not handle an effect from 1998-2000?

Protocultor: What are your hardware specs guys? Are you using Intel or AMD video cards? Which driver version?
That effect should present no trouble either on PC or PS1 emulation.

kageroushinobi: I'm using an nVidia RTX 2070 Max-Q. Played the game across the last few drivers, including the most recent ones as of this post.

To be fair, I'm not getting any performance issues emulating my PS1 copy via Beetle on Retroarch.