I need router suggestions and maybe a beginners link how to set my network up properly - my internet is kinda slow due to my nodes 😇

What are you using right now? And are you sure the router is the actual bottleneck and not the ISP itself?

co-founder of casaliz.co.jp, work in software/embedded/VR, interested in learning ethereum protocol and L2 development, farcaster.id/hosaka

I rent the router of my ISP. Mabe it could be bandwith but the data seems to come through but with time delay?
Never have problems with video playback over LAN but Wifi is so slow.

There are a lot of factors that can affect the network. For starters, you can switch your validator node from WiFi to a LAN cable. Does the latency cause issues with your attestations? Do you see missed attestations frequenty?