Doomsday Engine

Clients are subject to excessive warping while moving
fast (or moderately fast), especially when playing over
the Internet. Happens because the server is lagging
behind in updating the client's position and then
thinks the client is too far from where he 'really' is.

Potential fix: server trusts the client's position and
doesn't enforce a max difference. Server does minimum
buffering with ticcmds (due to the C->S lag they're
already late, so why increase the lag by buffering
cmds?). All movement happens on clientside, with no lag
(fwd, strafe, flying, jumping).

Other clients will see warping when the server
momentarily gets things wrong; e.g. a player falls
from a ledge even though he really managed to jump
before stepping over.

Labels: Multiplayer