velocity seems the same but it feels almost double the speed of portal 2. map and objects might be smaller relative to the character, so going the same speed but going along faster. maybe

Some of the movement commands were changed in Revolution so that's why the game feels different to play. Specifically:

sv_air_max_wishspeed 60(default is 100, in Portal 2 it's hardcoded to be 60)

sv_airaccelerate 5 (default is 12, in Portal 2 it's using sv_paintairacceleration instead, which is 5)

sv_jump_speed 232.379 (default is 220, in Portal 2 it's calculated as sqrt(sv_gravity * 2 * 45))

sv_speed_normal 175 (default is 150, in Portal 2 it's 175. you need to reload a level for this to apply)