Sluggish walking, no sprinting and airboat doesn't accelerate properly in Half-Life 2

In the folder the following folder:

Steam\steamapps\common\Half-Life 2\hl2\cfg

there is a file called autoexec.cfg that will run as soon as the game starts, it contained the following information on my system:

vr_translation_limit 1000;
vr_hud_max_fov 50;
crosshair 0.0;
fps_max 300;
bind "v" "vr_reset_home_pos;"
bind "JOY10" "vr_reset_home_pos;"
cl_forwardspeed 75;
cl_sidespeed 50;
cl_backspeed 50;
cl_upspeed 25;
alias "+fast" "cl_forwardspeed 200;"
alias "-fast" "cl_forwardspeed 100;"
bind "shift" +fast
alias "+duckfast" "+duck; cl_forwardspeed 200;"
alias "-duckfast" "-duck; cl_forwardspeed 100;"
bind "ctrl" "+duckfast;"
alias "+sprintfast" "+speed; cl_forwardspeed 450;"
alias "-sprintfast" "-speed; cl_forwardspeed 100;"
bind "alt" "+sprintfast;"

most of which explains why movement is altered.

Change the name of the file to BACKUPautoexec.cfg to ensure that you can still find it again if you need it. This also ensures that it won't run automatically every time you run the game.

Start the game again and rebind your keys to whatever you like and it should work just fine.