I noticed (already a while ago) when I turn the DPI function of my gateway on some sides, such as the one from "Kärcher" or "Automobilwoche" take forever to load.. even when in the VLAN of the device were I try to access the site, no filtering is enabled.

I want to use the the DPI function as AD & Analytics blocker, the function works well just some websites such as the ones I named take forever to load.

Not sure maybe it is related to the MTU issue I found earlier on the ER8411? Since the thing with the sides load forever is a bit similar?

Edit: Not sure what I did wrong but after some retries the issue is actually gone. The adblocking function works, works pretty well but do not enable the adobe experience cloud, see attachment. Whyever this causes many sites to not work properly also some parts of BMWs website do not load fully/ extremly slow when enabled. If disabling this at first does not take any effect restart your gateway, with the DPI function turned off. That fixed it for me.

Thanks for everyone and of course TP-Links support for helping!