linksys ea8300

So after Spectrum (my internet provider) came and checked to make sure they were delvivering 400 Mbps to my cable modem and Vefied that Cat 6 cable connect to modem to router was also getting 400 mbps then he did test on router (EA8300) it was only 90 MBPS So never trusting anyone i connected my...

Where does the built-in(on web interface) speed test test to? I can't find where it's testing 'to' from itself.....Thanks much for your thoughts!