This statement does not make any sense. Do you mean the VIS compile stage of your map is taking a long time? If so then use DETAIL brushes and create smaller areas with structures that will help reduce the portal sizes down to more a realistic size.
It really depends on what you are doing with lights. Like are you creating standard light entities or point lights. Have you looked at the sample map goldrush supplied with the editor. It has examples of standard lights and point lights.
ET uses external lightmaps and if you keep compiling the same map over and over again the lightmap directory can get out of sync with the map. Use different map revisions so that the lightmap directories are unique.
I really suggest you use a batch file for compiling and not the editor. Try this thread for help.
http://www.splashdamage.com/forums/viewtopic.php?t=3100&highlight=compiling
This forum has a big sticky thread with all previous useful threads. Check it out because it contains alot of information. It has links to previous threads on how to create destructible objects etc.
http://www.splashdamage.com/forums/viewtopic.php?t=1710
Sock
:moo: