Trouble GL-MT6000 (Flint 2) static IP configuration

Hi all

I'm trying to setup internet connection via static ip protocol and I have some connection speed issues.

When I connecting my Flint 2 to my Archer AX-73 with cable I getting about 700mbps but when I remove TP-link and put internet cable directly to Flint 2 I receive about 55mbps.

The only thing I changed in default configuration is WAN passwords.

Any advice would be greatly appreciated. Thank you for your time.

Which firmware are you running?

It's 4.6.8

With some strange way problem solved just with replacing internet cable