You can try that, it may or may not improve tbh, despite the game have a 2D look, some stuff still in 3D being processed (map structure).
What i already tried is, turn off in-game settings, like V-Sync, FXAA to use the driver counterpart, not sure if Intel Graphics have that tho, i did on my GTX660M driver, improved a well after the optimization patch, but the next patches broke the optimization so it is back to square 1.
Not sure if you tried change the models percentage in the xml file.
DrawMonsterPersent=“99” <— This is the monsters, 99 means all the mob will be shown, mine is 35 and still cause bad stuttering every now and then.
DrawActorPersent=“99” <----- These are the players (not sure if it count for NPCs) i set mine to 50, so in cities i don’t have to be lock down due to 0.x fps, stuttering at cities are common in my case, but still, it shouldn’t lol