US Telco Support > Verizon > Verizon Fiber Optics > Very slow upload speeds (starts out OK then slows down)

Very slow upload speeds (starts out OK then slows down)

Typically it'll be equipment failure. You could progress you're trouble shooting by going to a neighbor that had FiOS and ask them if they're having similar issues.
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Fiber Network Technician
Pomona, CA

I mean you're equipment at your home. Especially if your neighbors service works okay.
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Fiber Network Technician
Pomona, CA

reply to MisterBill
So, I'm still having this problem and finally got around to calling Verizon (the Verizon Support person on Twitter had reset the ONT last week) They had me reset the router and of course it did not solve it. They're sending me a replacement router. I'm not sure if that is likely to fix it. Would love to hear what solved other people's problems.

Hopefully I'll get the new router version to make up for the trouble of having to re-enter the wireless key on all of my devices.

You can just change SSID and Wireless Key on the new router to match what you are using now.

Why would Vz tell you to reset your wireless key?

I suppose that would happen if you had to do a factory reset. Personally I'd rather remember to change my key on the router once (even if it happened every once in a while) and not all of my devices.

That is a good point, I suppose. Anyway, it's on the truck for delivery today. Hopefully I get the N version of the router.

So I got a new Rev I router and installed it (I did set the wireless options to the same as the old router). The upload problem is still not fixed. In fact, it wasn't even getting started on the upload test, but then I updated the firmware to the latest and now it seems a little better but still does not complete and never gets above 3mb up.

As I mentioned earlier the Speakeasy speed test runs fine - I got a speed of 31 down and 18 up (not 25 but a lot better than Verizon). What would cause the Speakeasy test to be able to complete while Verizon's test and my real world experiences of doing stuff like sending files via email fail?

reply to MisterBill
So I have been going back and forth with Verizon support on Twitter. Today they finally had someone on their end run tests and they said it tests fine to the ONT. and suggested it could be an internal wiring issue. I have the router on a splitter, so I can check and make sure that everything there is OK, and what I might do is try putting the original router (which I haven't sent back) on another cable drop in the house and turn off the new one, and see if that solves the problem. Id it doesn't, I assume I can connect it directly to the ONT and see if it fails there.

I still do not understand why the Speakeasy speed test runs fine while the Verizon one does not.

For kicks, try selecting a different state for the Vz speedtest. I had issues once where certain states on the Vz test would download very slowly while others were fine. It ended up being an offsite issue w/one of the routes.

I have same issue (»Slow upload)

Verizon has replaced router and ONT and most recently had be test with laptop wired to ONT to bypass all internal wiring. They then had me go to numerous speed test sites until they found one that produced good results and gave me an "I told you so, everything is fine"

During an upload operation if I take a network capture I see a huge amount of Duplicate ACK's and a ton of retransmits. I even see this on "good" speed test sites (that presumably do nothing to see that the data is complete).

I have tried the Fios forum, their Twitter and the FIOS direct forum here and still have gotten nowhere.

My next step will probably be a call to Comcast :-(

Thanks for sharing. I had seen other (older) threads here with similar problems but the OP never reported on a resolution (if any). How do you do the network capture, that sounds interesting. In the "old days" we used to use a "sniffer" at work.

Is it failing on other speed test sites in addition to Verizon's? Are you seeing the same symptom as me where the upload test starts out slow-ish and then basically stops responding?

PS I also posted on Verizon's own site and got no response at all. Did not bother with Verizon Direct.

My speed tests sometimes work flawlessly, sometimes the upload starts fast then fades, sometimes the upload never runs at all.

I am not too hung up on the speedtest sites, I am more concerned with the fact that uploads to youtube, dropbox or google drive also suffer in addition to VOIP and Video chat for work.

For a network capture I use a software sniffer (free options include Wireshark or Microsoft Network Monitor). For me, they paint a pretty clear picture of whats happening, a large portion of packets I am sending out need to be retransmitted.

reply to MisterBill
New update -- decided to try the old router in the kitchen (turned off the new one first, obviously), since I had cloned the SSID and key so it's easy to swap. It never connected to the Internet, the orange light would flash or go off entirely. I logged into the console and it showed "connecting". Would there have been an issue with using two different routers, or is it most likely a signal quality issue? I didn't have any problems connecting the second router after turning off the first when I received it a couple of weeks ago.

Went back to the bedroom where the router is normally connected and tightened the connections at the splitter (Verizon provided) and the speed test still fails. Unfortunately I cannot get to the cable connection in my daughter's room so I can't try there. I may try connecting it to an unused cable in the basement and see if it works from there, or I could go up into the attic where I have another splitter (once again, Verizon supplied) and see if plugging it into the main line there works.

Does Verizon fix the coax if there are problems?

You need to release the WAN IP from the new router and immediately unplug it, then plug in the old one.