How to configure switch GS108PEv3 with multiple VLANs on a single port

I was hoping someone could point me in the right direction. I believe the issues I am seeing on my network are related to the way I setup the VLAN configuration on my switch.

I have a Ubiquiti EdgeRouter connected bo my Netgear GS108PEv3 switch and a Ubiquiti UniFi Access Point connected to the switch. I also have other wired equipment connected to the switch.

In order to be able to segregate traffic a bit better, I created several SSIDs on my access point, one with no VLAN ID and the others with a VLAN ID.

My network is working, but I am getting TERRIBLE latency and packet loss with devices on the Wifi networks configured with a VLAN and I checked everything on the wifi access point and router and it all looks correct, so I am suspecting that the way I configured my switch is the culprit.

I have a Netgear GS108PEv3, switch with the router plugged into port 8. I also have an access point (Unifi nanoHD, in case it matters) plugged into port 1.

On the access point I have 3 Wifi SSIDs: one with no VLAN id, another with VLAN 10 and the third with VLAN 20. So, on port 1 of the switch there is traffic from the three SSIDs (with VLAN id 1, ie not tagged, VLAN 10 and VLAN 20) while port 8 should pass all traffic, tagged and untagged, coming from the access point and the wired devices, to the router.

Should I configure the switch so that...?

• For VLAN 1 (default): ports 1-8 are U (untagged)
• For VLAN 10: ports 1 & 8 are T (tagged/trunk)
• For VLAN 20: ports 1 & 8 are T (tagged/trunk)

At least, that's the way I have it right now.

I would greatly appreciate any insights.