So as in title. I noticed my PC lost some of it's power in last days. BeamNG works worse, Forza Horizon 4 too, didn't check other games. BeamNG is running in 30fps, meanwhile Forza works in 50fps and with drops to 40fps. Previously both games were running in 60FPS. I checked for viruses, all clean. PC specs: Intel Core i5 8600k with Turbo Boost ON. 16 GB's of ram. 1060 6GB. What could be the reason?
It is possible there is something else eating performance, or it can be that you have some throttling issues. Throttling issues can be because of GPU cooling, CPU cooling or VRM overheating/failing partly. To start figuring out what is happening, I would see GPU and CPU loads and temps during the game using HWinfo and MSI Afterburner for example. Also task manager, check if there are other processes during the game that are using high amount of CPU or GPU. With what did you checked viruses with? Malwarebytes Antimalware is pretty reliable usually, some others might not always detect stuff. Also it is possible with windows 10 that some update has again caused performance loss or some new driver is installed that kills the performance. 399.07 Nvidia driver is giving me about 20% better performance than some recent drivers for example.
It could be WiFi as Forza might use or need more of it to run it than BeamNG. It could also be how high your graphic settings are on both games (for me I have BeamNG at lowest graphic settings and manage 50 FPS more or less)
Lolwut. You realise WiFi isnt linked to frame rates in beamng at all, and shouldn't be in Forza either though Forza does have a bug that extreme network latency or packet loss causes stutter as the CPU suddenly has to do more calculations for lag compensation
Beam should run on a 1060 just fine on high, monitor your clock speeds and temps like @fufsgfen said, and make sure you are plugged into your discrete GPU
There are two types of graphics, integrated graphics, which are built into the cpu. Discrete graphics are in the graphics card. In your case it is the 1060. Make sure your monitor is plugged into the 1060, not the motherboard. If it is plugged into the motherboard, you are using integrated graphics, which are quite crappy and not suited for gaming
If your trying to play on a laptop, make sure you are in high performance mode and BeamNG is actually using your GTX 1060 to render, not whatever integrated graphics is on that chipset.