Slowdown speed after switching from Spectrum RAC2V1S router to Asus RT-AC86U router - Time Warner Internet

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This question is about "Slowdown speed after switching from Spectrum RAC2V1S router to Asus RT-AC86U router", with Time Warner Cable internet and apps. I just switched my ISP from Frontier FIOS 75/75 to Spectrum Ultra.

I got both Spectrum Modem and WiFi Router (RAC2V1S). The speed I am getting is really fast, download 300Mbps. I originally wanted to use my Asus RT-AC86U router because I am more familiar with their settings.

I basically swapped Spectrum RAC2V1S to RT-AC86U, the speed decreased to almost 80Mbps download. I also tried, Modem -> RAC2V1S -> RT-AC86U but it was worst, about 20Mbps.



Did Spectrum added some proprietary technology between Modem and RAC2V1S so that if I use other router, I won't get 300Mbps-ish speed?

Slowdown speed after switching from Spectrum RAC2V1S router to Asus RT-AC86U router?
 
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