I think there is a small bug in the current 8.00.17.01 update. No pressing a few keys or editing the base config file will permanently fix this problem imho.
If you have previously selected to show your FPS on your screen during your last flight and then exit RC8 when you startup again you will see those 2 lines at the bottom of the start screen. You will also see them on your screen when you start your flight. These do not effect performance. They just add unnecessary clutter to the bottom of your screen.
The simple workaround I have found that works for me is to disable show FPS prior to going back to the main menu, then exit. When you startup again those lines will not be present in your statup screen, nor will they show up on your screen while flying. You can enable show FPS again while you are flying and those 2 lines will not show up, just your FPS, as per normal. You then just need to remember to disable show FPS before you stop your flight and before you go back to the main menu.
For now I will just avoid showing FPS since I now have settings that work very well and it's one less thing to remember to do. I would only turn them on again if I wanted to change settings in order to see the effect of these changes.
Otherwise, the latest public update seems to work pretty well (VR and non-VR). Since I had already got caught by the previous beta updates I knew enough to know I just needed to uninstall, reinstall, then update. Took me less than 5 minutes to do so no big deal imho. I'm still really enjoying RC8. Thanks Ikarus team!
Edit; Sorry, I forgot to mention that this problem only happens in non-VR (flat screen). I does not appear at all in VR mode. So since +90% of my RC8 is flown VR it's not much an issue for me, lol!