It's frustrating when you are trying to drive no HUD with missing speed signs but if you are getting "very upset" over it I suggest you see a counsellor.
Increase the details and increase the stuttering frame rates. They were probably left out for a reason. As was Mrs Goggins’ cat that sleeps on the doorstep of number 67…
... and no performance killer at all. You'd need at least 1,000 of them to have an comparable performance impact as one single loco - but given the detail of the 3D models in TSW I recon it's probably more like 100,000 speed signs. Given the overall detail of the area it's most likely that there wasn't enough time to place them properly during SEHS' development...
I've never seen a 395 come along that track in TSW2, you sure it's not TS? Also if that makes you "very upset" I'd recommend speaking to someone.
That is TS, which is the point. KHS in TSW is missing heat the TS route has. Poor show for the 'future of train simulation'.