just installed the Beta test and filed a support ticket due to the frame rate still drops when moving the camera slightly (I experience this issue since the SP6 update, I still using SP5 HF due to this annoying issue)
the shader compiling is already finished and as soon as I start to roll, the FPS drops from around 60 to circa. 30-45, if standing still in roaming view I get like 90 FPS (even when I move the camera)
my hardware if relevant: AMD Ryzen 7 9800x3D, 64GB RAM, RTX 4070 TI Super, Trainz (Beta) and...
in (Beta) Build 133407, the FPS still significantly drops when driving and looking around (tested on the Milwaukee Road Avery - Drexel, Session: "MILW - Transcontinental Westbound Freight Train (summer time)"
the new Beta was fast to install and didn't take a long time. The precaching also didn't last that long (on a small route) + loading a different route (Milwaukee Road Avery - Drexel) was not a huge deal either. However, SpeedTrees on this route don't render that far away and the FPS still drops...
I forgot to reply to your message, but again: I also would like to test the Beta version. Especially to test the performance + a rendering issues with random baseboards at the corner of the screen being either not rendered or with artifacts (I first discovered it earlier this year)