Netgear Cable Modem Slow Download Speed

NETGEAR CM500-1AZNAS (16x4) DOCSIS 3.0 Cable Modem only provides 38Mbps vs. cable modem's 150Mbps. Specs for the Netgear say up to 620Mbps.  The upload speed is 5.7 which equals the cable modem.  There are no adjustments in the modem.
genusysAsked:
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JohnBusiness Consultant (Owner)Commented:
It has lower throughput than your cable modem and so since there are no adjustments, all you can do is upgrade the firmware and test and if that does not help then get a faster box
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PerarduaadastraCommented:
Talk to your internet provider. Does your ISP allow you to use your own equipment rather than what it supplies? Most don’t, so it’s possible that you’re fortunate to have a connection at all.
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genusysAuthor Commented:
perarduaadastra:

Comcast supports it. It activates through their portal.
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JohnBusiness Consultant (Owner)Commented:
Try updating the firmware to see if that helps.
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genusysAuthor Commented:
John:

It is rated for much higher download speeds and it gets the correct upload speed.  I left it connected but, the firmware didn't upgrade.
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JohnBusiness Consultant (Owner)Commented:
You need to go to the section in the Netgear router (maintenance probably), look for firmware and manually update it.

It may not reach rated speed in your environment.  After updating firmware, you will know.
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JohnBusiness Consultant (Owner)Commented:
The specs say:
"CableLabs® DOCSIS® 3.0 certified to work with U.S. cable Internet providers like XFINITY® from Comcast, Spectrum, Cox, Cablevision & more (not compatible with Cable bundled voice services)"

Do you have VOIP?
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JohnBusiness Consultant (Owner)Commented:
Also in here I read:

https://www.amazon.com/NETGEAR-CM500-1AZNAS-download-Certified-Cablevision/product-reviews/B06XH46MWW

1. The reason these routers slow down when you enable extra features is because it disables CTF (cut through forwarding) and the router no longer uses it's faster processor. Some of the newer routers can still maintain max download speeds of 941 mbps while also allowing you to use QoS and other features.

2. Keep in mind that this Netgear CM1000 is JUST a cable modem. It's not a router. So if you only have 1 device you want to wire into it, you're fine but if you want to have more devices, and wireless, then you'll need a router too.
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genusysAuthor Commented:
John:

I have a router.  There is no way to update the firmware on the device. Netgear says the ISP will update it but, comcast won't update a 3rd party box.  Basically, it just doesn't perform as advertised.  

I was speculating, however, that it is in the cable company's best interest to "accidentally" throttle 3rd part devices. <g>
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genusysAuthor Commented:
Thanks for the help
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JohnBusiness Consultant (Owner)Commented:
Thanks for the update. I guess the ISP’s are trying to promote their own devices
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