More than 4 water resources = lag
2 is the recommend maximum amount.
1 building set should be used so the map doesn't lag horrifically, especially true in larger maps.
There is a soft limit on the amount of objects a map can use, but it is so rare that this happens, that I have forgotten it, however is it the common mistake of new mappers, just like water sources.
oh yeah thanks, true dat , lets hope that coh3 will able to handle much more traffic and sizes . i used to do half-life 1 maps back in 2005 but this creation kit is much more relaxing and transparent. tho plenty unwritten rules and limitations about mapping are everywhere. u can link some useful info if u know about something that i should read about (especially what not to do), i would love to see some of that. my next map will be something similar but i think i just use 500x500 mapsize or maybe even less. 2x water sources and 1 or 2 building sets, but some of the sets from various missions have also perfect objects and cars that i like to use. gotta find that perfect balance.