Thank you for your reply @luochongjun. I have tried both 2.4ghz and 5ghz. also tried with the same ssid. Adguard indeed causes some delays but never experienced this huge deviation in speed. When I switch from Flint to ISP router the speeds are back to normal. Even with VPN running on each device separately.
Hi @luochongjun ,
All good now. thanks!
I have measured my speed thru ethernet as suvveated and has been great. Tested on ISP router, then on Flint, then with Adguard then with VPN and lastly both. All worked great with expected results. So, I turned off everything and switched them back on one by one on WiFi while testing speed. I am vetting lower speeds than ISP router but at an acceptable rate.