The speedrun moderators have largely accepted that nobody can consistently achieve perfect bhopping in L4D2 due to the game's low tickrate. "Nobody really bhops in runs, anyway, because we're all shit at it compared to pros and end up wasting time," one community member quipped.
[Run Forward (W)] ➔ [Jump & Release W] ➔ [Hold Strafe (A or D) + Arc Mouse] ➔ [Perfect Jump on Landing] The Manual Formula left 4 dead 2 auto bunny hop verified
If you're playing on a local server, try typing sv_cheats 1 and then nb_move_to_cursor to test your bhop speeds against AI paths! The speedrun moderators have largely accepted that nobody