I have heard of other measuring types, but they are not relevant to mIRC.
I recommend using $ticks rather than $ctime as $ticks is measured in milliseconds. Please also note that my experience with $ticks has shown that it can be off by anywhere up to 5 milliseconds.
Thus if your timing using $ticks shows 45 milliseconds, it could really be as low as 40 or as high as 50.
This probably is subject to the speed of the system, but I haven't noticed a difference between my systems, the slowest of which is 866 Mhz, the fastest 2.2 Ghz.
