[P4rD0nM3]

Choke happens when the server tries to send more data than a client can handle. It prevents itself from sending it to the client since it believes the client can't handle it.

Now I don't know if this still holds true for HLDS I remember Leon from Valve saying just set sv_maxupdaterate to 20 to reduce choke.

I'm pretty sure the more prominent GSPs out there would beg to differ.