Issues on slow connections with some cameras

[bublath]

I have set up RTSPtoWeb to be accessible through Nginx from remote. Some of my cameras don't work too well (cheap one from aliexpress) - they sometimes freeze and don't recover automatically. With reducing their framerates etc. I managed to make them work most of the time when on local LAN.

However when using the remote connection two of my cameras won't connect (interestingly a 3rd one of the same brand does). I also notices that the one camera that is just connected by WLAN works much worse (even on LAN). Just to clarify, the connection is Camera ->(LAN/WLAN)->RTSPtoWeb->(LAN)->nginx->(LAN)->router->(DSL)->remote browser

Any hints how to improve using cameras that are on slow connections?