A

Visitor

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2 Messages

Monday, June 12th, 2023 1:08 AM

Closed

Slow speeds, as low as 10 Mbps

Hi,

I have the 800 Mbps download speed Internet plan, and until recently I always used to speed test at or above that.  But recently I've seen lower speeds, down to as low as 10 Mbps at night.  Here are some recent speed tests from May 31 around 11:45 pm, from a machine connected via Ethernet to my router:

Google: 9.16 Mbps

https://imgur.com/9c1VQFi

Fast.com (Netflix): 35 Mbps

https://imgur.com/EJyuVWc

Cloudflare: 9.45 Mbps

https://imgur.com/Wv1xf3O

I own my own model, an Arris SB8200 which is fully supported up to ~950 MBps.  

Accepted Solution

Visitor

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2 Messages

2 years ago

You can disregard this, my speeds are back up to expectations.  I guess the issue was transient.

Gold Problem Solver

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26.3K Messages

2 years ago

Slow speeds, as low as 10 Mbps ... 800 Mbps download speed Internet plan ... Arris SB8200

Slow speeds are often due to poor signal quality along the path between the modem and Comcast, typically poor coax connections or damaged coax cable, usually in or near your home. Running the cable through a surge protector, a defective splitter, or too many splitters can cause signal problems as well. If there is an amplifier in the line make sure it's getting power. 

If you want to troubleshoot this yourself, please see Internet Troubleshooting Tips. If you still need help, please post the following information from your modem (from http://192.168.100.1):

  • downstream: power levels, SNR (or MER), error counts, and uptime
  • upstream: power levels
  • event log, if available (Be sure to remove or blot out any MAC addresses. Forum security processing considers them "personal information" and may prevent the event log from posting if these are present.)

If you can't find the problem or you'd rather have Comcast take care of it and an employee does not respond to your message here, call them at the phone number on your bill or 1-800-Comcast, or use one of the options on https://www.xfinity.com/support/contact-us/. It's not likely they can fix the problem remotely. If not, insist they send a tech out to identify the cause and correct it.

If the tech finds bad coax, splitters, amplifiers, or connections in your home (even if Comcast originally supplied them) you'll probably have to pay for the visit ($70-$100) unless you have their Service Protection Plan ( https://www.xfinity.com/support/articles/service-protection-plan, closed to customers that don't already have it). If the trouble is due to a faulty Comcast rental device or anything outside your home you shouldn't be charged.

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

Official Employee

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443 Messages

2 years ago

@

Afty12345  I'm sorry to hear of your speed concerns. Were you able to capture the information as advised by @BruceW  ? 

 

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