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I have a probem.it's optimization.I think how optimzing to huge outdoor maps for 2years.And,I had try 3 ways.
As a result,I confuse more.

First way - Set big entity object.And,background buildings set to dynamic and remainders set static.As a result,lag is decrease.but when I chage view angle,dynamic entity hide and some static entities disappear at start test game.

Second way - I made big buildings.they are segment.but
As first way,I change view angle,they hide.And lag is little decrease.

Last way - this time,I try 2ways at up line.
I made segment buiding object.merely,I made segment that I made building to stratums.And Some background buildings set dynamic.
As a result,lag is decrease and no one hide.but when I see specific area and I go to there,lag increase more.

I'm laborious of this happenings.