Generally not connected world (Grand Theft Auto 5)

Mirdsen Drozd
check the integrity of files

Mirdsen Drozd
So turn the shadows back

I understand, turning off the shadows was a deliberate effort to improve performance.
But, there's just not dealing in the shadows (the Disappearance of textures).
Usually in such cases (Partial loss of textures) is recommended to increase the priority GTAexe in task Manager).

But, then hike leakage operatives.

Try to restart your computer after you close all other programs running in parallel (Except for background tasks system prilozny).
Run at low settings with shadows ENABLED.

If little RAM, it is doubled (on the Basis of your operatives) size of the paging file.

Same here can help reinstall the game (Extreme measure).

the world is so flat that doesn't want to pogruzitsya)

I already did!
Thank you for your help!