iCloud Photo Library backup occupies x5 more space than local iMac copy while Storage Optimization is OFF

Hi!

iCloud Photo Library backup occupies x5 more space than local iMac copy while "Storage Optimization" turned OFF.

80GB vs 531GB

And yes - Storage Optimization is OFF.

PS Recently I imported about 500GB+ data, most of which are duplicates and were deleted and Erased from "Recently deleted". How long it takes for iCloud copy on media library to take appropriate to local copy changes?