GS305v3 and Google Wifi Router

[Klubby]

Recently purchased a GS305v3 to connect to a Google Wifi Mesh router. Wired speeds without the switch and directly into the modem run about 700-900 Mbps. Wifi connections to the Google system run around 300-400 Mbps. However, when I run anything from the GS305 which I've attached to the Google router, I only get speeds just over 100 Mbps. I've searched and cannot find any information on this configuration. Anyone have suggestions? 

Thanks!

[schumaku]

Where is this switch connected into the Google WiFi router system - upstream between WAN port and modem, or downstream on the router LAN port?

[Klubby]

Downstream

[Klubby]

Anyone have any other ideas on how to improve speed on this? Thanks!

[schumaku]

Hard to imagine the switch (able to handle full link speed any to any port switching) does slow down. Challenge Google WiFi ...