Using Unofficial Arcanum Patch, and the game generally works fine.
But as soon I do transition into new map (even the first blimp crash site map at the game start), the game takes well good time to load all visuals.

What's worse, this continues in similar extend even when moving around.

What's the deal?
I don't remember having this issues before.

Are there some extra graphics options?

the "watch" keep turning, and for several minutes, before the map opens.

https://imgur.com/6530m0y

First after rolling the resolution back to vanilla, the game works as designed.

//Arcanum High Resolution Patch Settings

//Basic:
Width = 1280 // original: 800
Height = 720 // original: 600
BitDepth = 32 // original: 16
DialogFont = 1 // 0 = size 12, 1 = size 14, 2 = size 18
LogbookFont = 1 // 0 = size 12, 1 = size 14
MenuPosition = 1 // 0 = top, 1 = center, 2 = bottom
MainMenuArt = 2 // 0 = black, 1 = fade to black, 2 = wood
Borders = 1 // 1 = add borders to most UI graphics

//Graphics:
Windowed = 1 // 0 = fullscreen mode, 1 = windowed mode
Renderer = 0 // 0 = software, 1 = hardware
DoubleBuffer = 1 // 0 = disabled, 1 = enabled (unless windowed)
DDrawWrapper = 1 // 1 = install DDrawCompat wrapper
ShowFPS = 0 // 0 = no change, 1 = always enabled

//Advanced:
ScrollFPS = 60 // original: 35, max: 255
ScrollDist = 30 // original: 10, infinite: 0
PreloadLimit = 60 // original: 30 tiles, max: 255
BroadcastLimit = 20 // original: 10 tiles, max 255
Logos = 1 // 0 = skip Sierra/Troika logos
Intro = 1 // 0 = skip the main menu intro clip