Optimization of jump height in Mega Man X (especially when wall climbing) is not a trivial matter, so here are the tables related to how high the player can jump when holding down the jump (B) button.

The tables are also posted at https://docs.google.com/spreadsheets/d/1BR8BC8s54yx5Lbk4FKMoXY8jj1oAfyWlASTAQQor-pg/edit?gid=0#gid=0

Note: Doing a walking (not dashing) jump from ground that slopes downward uses different values.

All height values are in subpixels (1/256 pixels). When releasing B, the player starts falling and drops by 64 subpixels.

All height values are in subpixels (1/256 pixels). When releasing B after the first 14 frames of a wall jump, the player starts falling and drops by 64 subpixels. If B is released before 14 frames, there is no effect.

The first 6 frames of a wall jump do not give any height.

For optimal wall-climbing, jumps of 13 frames are ideal. However, this is only possible if there is a narrow shaft where the player can switch sides while wall jumping. If jumps of 13 frames are not possible (such as on a one-sided wall), jumps of 20 frames are ideal.

Jumps of 13 frames are temporarily possible if the left+right wall jump glitch is used (when up against a right wall, press left+right and for one frame X will grab an invisible wall on his left side and can wall jump from that).