After some testing, I noticed a few things:
- It have to load on Listen Server (the server you load when you start ingame) first. Delicated Server (HLDS, ReHLDS,...) can't generate the nav file. But still load if you copy the nav file generated from Listen Server.
- I tried the biggest map I could find to test the generation: Big City
It took about 45 minutes to 1 hour to load and it showned as if it stuck at loading screen so some might think it doesn't work. But the Nav actually generated which actually a good thing.
- The generating time is faster (or equal) the Z-Bot NAV generating.
I will do some extra testing with some Zombie NPC to see if it affect the PC performence
Update: Generated Nav file attached