ID:2184855
 
(See the best response by Super Saiyan X.)
There is no mention of client.fps or client.tick_lag on DM's Help On Topics (F1).
Make sure you are using an updated version of BYOND. They are definitely there.

In response to FKI
My BYOND version is the most updated stable one. Do not mistake world. with client.
Best response
They're definitely in there - try updating your BYOND to the latest BYOND Beta build. Those features haven't been available in the stable builds yet. They were added in Build 511.1348.
In response to Super Saiyan X
I see. I thought they were already avaiable but only missing on the help on, thanks.
In response to NSBR
I don't understand how my post was unclear when all SSX did was repeat what I said practically verbatim...

But whatever; I'll avoid wasting my time posting.
In response to FKI
Butthurt much? My byond version is up to date as you can see:
http://i.imgur.com/71fsxp3.png
You didn't specify, as SSX did, that it was a beta only feature for the time being, hence why my vote went out to him.