Dimensions and movement data?

I’ve posted something similar in Q3W, but maybe someone around here has a better idea: I’ve been mapping for Source and decided to give Q3 a try. With Source, there’s a lot of detailed information on in-game units, such as player speed, bounding blocks, etc. Check this page: https://developer.valvesoftware.com/wiki/Dimensions

Where can I find similar info for Quake 3 and ioquake3?

Someone linked me to: http://icculus.org/gtkradiant/documentation/q3radiant_manual/appndx/appn_c.htm#mapinfo

But it seems incomplete and a little confusing. For example: is movement described as in units per second? Per frame?