Morning all, bit of a long post but please bear with me 
I have BT Fibre which runs in to my house through what looks like a Huawei modem (standard BT issue jobbie). This then runs into a Homehub 3, after which all my devices are connected wirelessly, in most cases using whatever cheapo adapter I had lying around, usually one of those tiny USB dongles. This seems to be ok, but is that really the case? I'm trying to eliminate all causes of a slow connection here.
The wireless is slow and unreliable, which I'm lead to believe is a common issue with the Homehub 3 (anyone care to comment on this?).
Unfortunately homeplugs aren't an option as the wiring in my house seems to have been installed by Stevie Wonder.
The distance between my PCs and my router is about 10m with at most one wall inbetween them.
I'm trying to set up a media server which means I need fast, reliable internet.
So what's the best course of action here? Replace the router with something better? Replace the WiFi dongles? If either or both of these are the solution, can anyone recommend anything?
Cheers in advance!

I have BT Fibre which runs in to my house through what looks like a Huawei modem (standard BT issue jobbie). This then runs into a Homehub 3, after which all my devices are connected wirelessly, in most cases using whatever cheapo adapter I had lying around, usually one of those tiny USB dongles. This seems to be ok, but is that really the case? I'm trying to eliminate all causes of a slow connection here.
The wireless is slow and unreliable, which I'm lead to believe is a common issue with the Homehub 3 (anyone care to comment on this?).
Unfortunately homeplugs aren't an option as the wiring in my house seems to have been installed by Stevie Wonder.
The distance between my PCs and my router is about 10m with at most one wall inbetween them.
I'm trying to set up a media server which means I need fast, reliable internet.
So what's the best course of action here? Replace the router with something better? Replace the WiFi dongles? If either or both of these are the solution, can anyone recommend anything?
Cheers in advance!