Hey, congratulations for the launch of version 1.2, great improvements on atmosphere and sounds (they make it even more immersive now).
I saw your post regarding the graphical effects on performance and wanted to add this from my findings: with "Good quality" preset and "Reflections" turned "off" I get fireflies on the edges of the passenger seats, sometimes with flashing white squares around them. Same effect is visible from the helicopter cameras and also on the incoming trains (from the opposite direction). Frame rate tanks a bit when I rotate my camera to look at them specifically (60 to 40-30). I'm attaching an image in case my description is lacking.
I know you mentioned you haven't optimised it yet, hoping this will be of some aid when you get there. All the best ! :D