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Author Topic: Slow download speeds - interesting findings during troubleshooting  (Read 886 times)

tigeralum2001

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Hi,
Experiencing very slow download speeds.  Internet is fiber to house (no modem, just cat 6 to the WAN port) 250Mbps up/down.  Region- Eastern USA

Anyhow, my phone was lagging horribly so I ran speed test on it and got 1Mbps down, 75 up.  Googled for a while and followed many suggestions, including downgrading the firmware.  Nothing worked.

After more troubleshooting, I turned off Smart Connect and gave each band its own SSID.  This is where things get interesting.  On 2.4Ghz band, I get 30 down/75 up.  On Primary 5Ghz, I get 55 down/100 up.  On Secondary 5Ghz, I get 0.39 down/ 66 up.

What on earth is causing the secondary band to have such a low speed?  Apparently it is causing conflicts when in Smart Connect.

I'm fine with 30+ down for my purposes (heavy use devices are hard wired), but I hate that Smart Connect is useless.  Does that mean MU-MIMO is also not working?  Any ideas on how to fix this?
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FurryNutz

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Re: Slow download speeds - interesting findings during troubleshooting
« Reply #1 on: October 25, 2018, 06:31:09 AM »

Link>Welcome!
  • Link>What Firmware version is currently loaded? Found on the routers web page under status.
  • Are you wired or wireless connected to the router?
What devices are you using to test speeds?
What are results of using a wired PC?

  • Was a Factory Reset performed before and after any firmware updates then set up from scratch?
Link> >FW Update Process


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tigeralum2001

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Re: Slow download speeds - interesting findings during troubleshooting
« Reply #2 on: October 25, 2018, 07:47:47 AM »

Same results with firmware 1.15 and 1.21. Historically, I found similar complaints about 1.2 and going to 1.0 fixed them. I’m not willing to go back that far and lose security improvements.

Speeds quoted per my phone on wireless. Wired has a solid 240 up/down. Wired is not an issue.

I did not do a full factory reset as I didn’t want to redo all of the settings, it was power cycled a few times.
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FurryNutz

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Re: Slow download speeds - interesting findings during troubleshooting
« Reply #3 on: October 25, 2018, 08:25:24 AM »

What is the Mfr and model# of this phone your using?
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tigeralum2001

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Re: Slow download speeds - interesting findings during troubleshooting
« Reply #4 on: October 25, 2018, 11:35:24 AM »

iPhone X. It’s not the phone, it’s the router...
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FurryNutz

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Re: Slow download speeds - interesting findings during troubleshooting
« Reply #5 on: October 25, 2018, 12:21:54 PM »

What iOS version is loaded on the X?

Is this the only wireless device you have tested with?

I'll pass this onto D-Link for review.
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tigeralum2001

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Re: Slow download speeds - interesting findings during troubleshooting
« Reply #6 on: October 25, 2018, 07:49:55 PM »

All iOS devices are 12.0.1. I can replicate on another iPhone and and iPad.
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FurryNutz

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Re: Slow download speeds - interesting findings during troubleshooting
« Reply #7 on: October 26, 2018, 06:27:35 AM »

Thank you for this information.
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GreenBay42

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Re: Slow download speeds - interesting findings during troubleshooting
« Reply #8 on: October 26, 2018, 07:22:37 AM »

Can you turn off encryption and test the speeds?

MU-MIMO should not be affected. I do not believe the iPhone X has MU-MIMO so not a factor.

The secondary 5GHz band definitely should not be that slow. Have you contacted tech support?
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FurryNutz

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Re: Slow download speeds - interesting findings during troubleshooting
« Reply #9 on: October 26, 2018, 09:44:21 AM »

Not sure if this would show anything relevant, you might try loading v1.11 and test...I see v1.02 then it jumps to v1.11.  :-\

Trying to see where the drop in performance came in at is all...
« Last Edit: October 26, 2018, 09:45:55 AM by FurryNutz »
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FurryNutz

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Re: Slow download speeds - interesting findings during troubleshooting
« Reply #10 on: January 17, 2019, 07:56:28 PM »

Any status on this?

All iOS devices are 12.0.1. I can replicate on another iPhone and and iPad.
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tigeralum2001

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Re: Slow download speeds - interesting findings during troubleshooting
« Reply #11 on: February 14, 2019, 08:37:24 AM »

Interesting development. I thought the router was dying/losing radio strength. Couldn’t figure out why on earth it was behaving this way.  I started researching new routers in preparation for buying a new one, then decided to give it a last ditch effort. I installed DD-WRT firmware, configured it the same (separated the 3 bands, tested them separately, etc. my 2 5Ghz bands were getting max speed, no problem (250Mbps), but 2.4 was getting only 3 down and 6 up. Again, makes no sense. Then I noticed a setting that I didn’t recall on d-link OEM firmware. The channel width was set to “narrow - 20 MHz” I switch it to “wide- 40 MHZ” and my speeds went to 150 up/down. That is good enough for me on the 2.4Ghz band.

I don’t recall “Channel Width” option with OEM firmware or what it was set to if it existed. Maybe it is there, but I’m sticking with DD-WRT. Love the extra configurations, specifically greater number of Static IP addresses it allows. Tons of other great features- and a much newer release than the D-Link firmware.
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FurryNutz

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Re: Slow download speeds - interesting findings during troubleshooting
« Reply #12 on: February 14, 2019, 08:50:44 AM »

There is Auto Channel Width and 20Mhz Only think on stock FW. Would have been something to try on stock FW.
Possible issue here maybe however you would have to load up Stock FW to see. Sounds like WRT is working however so Enjoy.
 ;)
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