Sorry, I completely missed this video, which has some interesting points in it.
First of all I want to point out, that investing into PC hardware is not the glory to solve all problems. It is more likely to fix some problems to get other problems somewhere else. So the second part of the puzzle are the options and I guess to optimize the graphics options has more impact on the performance than any Euro you spent.
Also this doesn't take LOTUS and its optimization out of the equation. But vice versa nobody with an average PC should play LOTUS with bunch of heavy stutters. You may have to reduce your graphics settings for a time. And last but not least there is no need to play on the maximum graphics settings. Beside that the presets are only presets and have to be adjusted for the best performance on your special system.
So let's jump into the video:
I partially skipped through the video while you were driving, but I've seen a quite stable FPS around 30 (which is quite ok regarding your settings), but there are tons of stutters when reloading. If you have a second monitor, you can put the Task manager on your second screen to watch the usage of your hard drive, LOTUS is installed on. If I'm right, there should be spikes in the diagram when a stutter occurs. To minimize them, let's go through your settings:
These 3 settings are a bit over the top. As we currently got mostly tram routes, a max visibility of 1000 m for buildings is enough imo, 500 m should be enough for trees. The settings for 3D trees can be set to the second lowest setting on the left.
The first slider defines, when the max resolution of the scenery is loaded and for now this setting gives me headaches some times. I would recommend to put this setting more to the left, to decrease the stutter. The terrain detail slider can be set always to the left on "low", because it is not needed yet, because the maps are mostly flat.
I hope this reduces the stuttering without having much impact on your graphics.