http://dragonmodz.org/phpBB2/viewtopic.php?t=11014&view=previous&sid=dc574f53800a411211d2626612abeb87 said:
8. Testing Your Map The Right Way
Load up your map. In console, type the following:
developer 1
r_speeds 1
Close the console now. You will be shown several numbers at the top of your screen. First is your FPS (frames per second). Next is MS (Miliseconds), this is your lag. Next is WPoly (World Polygons). This is what matters most. This is how many faces you are seeing currently.
WPoly:
Under 400 - Too low, go and add more detail
400-800 - That is a bit low and good.
800-1200 - This is what you should shoot for. You will have good detail without causing FPS loss.
1200-1600 - Getting a bit high, but it is still okay. You won't get much FPS loss, if any.
Above 1600 - Too much. You will get a lot of FPS loss and can cause regular lag.