Open World Streaming

I am implementing open world and trying to stream Recast Graph Data around the player. I look through other post and find out about TileHandler.LoadTile. So I did it and load the navmesh tile around the player. But it takes around 180ms to load one tile. This is too slow. So I did split your Recast file into multiple chunk and load them around the player. This give me a better result and now one tile take 90ms to load. The most time is spend on BBTree.RebuildForm. So is there any way that I can speed this up or async load this?
The world is pretty big but is not procedural.

Thank for the help. Cheers.

Hi

I answered your PM.
If you have a test case which takes such a long time, would it be possible for you to send that graph to me so I can test it?

Hi,

I reply on the PM and send you a link to those mesh files.