I just wantwed to make this post, cause there always seem to people asking how to increase fps and decrease compile times. I just have an example of good an bad using only func_detail Before: After: After func_detail-ing all of the 'details' the number of numportals went down from 6217 to 178. Thats over a 34x time decrease, imagine the gains. Main improvement is the compile time as this is exponential (or similar). The later was a matter of second whereas the first would be at least 20hrs (I did not leave it fully only enough to work out the number of portals). This was a single room (with approx 600 brushes), so just imagine the gains over a whole map!