Timing begins when selecting either Zero or X and ends when you lose character control by meeting General.
The US Playstation version is considered the "standard" version. Faster original versions (PC, Saturn) will have loads converted to match. Slower versions (Japanese PS1, PS3) will not, but will still be listed.
Allowed Emulators: Xebra, Bizhawk, Mednafen. These are slower than/equal to console loads and will be listed with console.
"Easy" on PC version is not allowed.
Low% (X) rules:This category requires completing the game as X, having collected none of the upgrades.