RT-AC3100 speed issues

  • ATTENTION! As of November 1, 2020, you are not able to reply to threads 6 months after the thread is opened if there are more than 500 posts in the thread.
    Threads will not be locked, so posts may still be edited by their authors.
    Just start a new thread on the topic to post if you get an error message when trying to reply to a thread.


New Around Here
Xfinity GB plan
Modem CM1000
Modem to computer 860Mbs/42Mbs
Modem to router (using GUI internet speed) 500Mbs/42Mbs
Router to computer 320Mbs/42Mbs
Wireless 324Mbs/41Mbs

RT-AC3100 current merlin firmware. 386.1.2
reset to stock
QOS off, Jumbo frame enabled
RESET Modem/Router
Tried multiple cables, those that provide the best speeds are being used.

Any thoughts?
Last edited:

Sign Up For SNBForums Daily Digest

Get an update of what's new every day delivered to your mailbox. Sign up here!