ProMods

I've got a gtx 1060 and it absolutely can handle the game well. What I do is reduce reflections to medium, shadows to high, and mirrors to medium. Frankly I doubt there is any graphics card that will give you 60fps in all cities ! Until SCS improve the game engine there is simply not much anyone can do IMO.

The game doesn't use that much ram either. I'm on 8gb's and it never uses anywhere near the available ram.

I'm on a GTX760 2GB, which looks bit out-dated as 2018 but still holds SCS recommended requirement.
keep most setting to highest at scale 200% except mirror quality to medium, mirror distance to high and disable in-game AA.

while hanging around in Milano, even flying by camera 0 (means no need to draw interior and truck model), the game still somehow can't keep up to 30fps
London is little better, most time floating around 30fps, but while circling around roundabout the game would struggling to crazy lot tc and drawcalls.





night time may also affects performance, but lowest around 20fps and deal with almost 10K drawcalls really looks like overkill for the game engine
while 1.32 vanilla make game runs smoother, hope PM2.31 could also benefit from update.

Yes the London and Croydon areas are not that well optimized. It'll taken care in a later update

Try this: Got to the Options Graphic Menu in ETS 2 and look for Gras Amount, if its set to user-defined change it to High, Apply and drive - i had also this stutter with an GTX 1080 and now after changing this its gone.

Note: You must do this on every ETS 2 start.