How map work in Source2?

I want to find information about technology that using to optimize maps in Source2.
For example in Source1 is BSP, PVS system, portals, indoor world.

I was surprised that how many CPU resources need to VIS calcs for а simple map in source2, Well I think I dont understand how it all works.

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What

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well VPKs are used to store the maps now

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