8.4.9 have same issues with saves by my side. Just take a bit longer get impossible to load.
Even getting down to 1024x768 ana everything on low does not help at all.
by my side is all okay now.
do you have start a new game, not load an old save?
do you have an clean install?
(it means you have to delete the wicked island appdata folder too)
C:\Users\yourname\AppData\Local\WickedIsland\Saved
it should work than fine so far, i guess.