looking at errors and loadingtime in a readybuild game, staying below 1650mb (size at the end of build-process, remind that it dramatically lowers when bin/dbos are in place, so pretest the levels before finalbuild so bin/dbo are written) works fine for me without getting crashes or other problems and acceptable loadingtime, below 1400mb loadingtime is really good on my machine.
ram-use mainly depends on the areasize used on the map, so dont spread too wide or in height to get good results and lower ramsize.
