Internet speed test not accurate for 1Gig circuit

I did a speed test from several speed test sites for my 1 gig Internet circuit and my download and upload are so different. The upload seems fine but the download is so off. It never passes 250Mbps. I have another 300 Mbps with another ISP and when I tested it with the speedtest sites, the download and upload are almost the same, around 250Mbps.
The tech was onsite and tested with his test set and he said that he gets around 900Mbps upload and download.
How do I explain this? Can I trust the 1G circuit provider? What is the explanation for the speedtest sites reported big differences between download and upload.

Any thoughts? Thanks
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leblancAccountingAsked:
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CompProbSolvConnect With a Mentor Commented:
I'd look at how the two of you are testing.

Are you both going through the router?  What site(s) are you using for testing and what is he using?
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atlas_shudderedConnect With a Mentor Sr. Network EngineerCommented:
Agreed.  If the router is only rated at 250 or 300M then you are going to bottleneck there.  Your circuit can be fine but you'll never see the full gig due to the router's capability.
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nociSoftware EngineerCommented:
Well if you do a speed test with a file transfer..... bandwidth of disks (esp. on laptops) is limited...
If network testing tools were used (netio f.e.)  then only the network is involved.

Then  was wireless part of the chain?  if so were all components for wireless 802.11ac capable & setup for ac?   (that would allow wireless speeds to exceed 1Gbps.. in theory under good circumstances).

Best to test: have a laptop that can really handle 1Gbps on a wired interface and use that to test access to the internet.
using f.e. netio   https://web.ars.de/netio/
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masnrockCommented:
As previously cited, was the tech's test done behind or in front of the router? And how exactly did you test? For example, Comcast likes to request people use their Speedtest servers. Inherently, that keeps the test solely on their network and avoids some other variables. If you use speedtest.net itself, you may get a very different result.

Also, what type of router do you have?
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leblancAccountingAuthor Commented:
I have the 1 G circuit connected directly to my PC 1gig LAN card. The tech is using the Y.1564 standard test. His test set is connected directly to the circuit.
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nociSoftware EngineerCommented:
Try netio as mentioned before,   You will need someone else that also has a 1Gbps connection to test with.
Preferably on the same core network.
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atlas_shudderedConnect With a Mentor Sr. Network EngineerCommented:
He's only testing to a loop.  Most likely to the next nearest switch and back.  He isn't testing full path to a host on the internet.  That's a big part of the difference between the two test qualities.

The next thing is most likely going to be your PC.  Just because you have a Gig NIC doesn't necessarily mean that your host can dump that much traffic onto the wire at a given moment.

Is this a link in your home or corporate?
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CompProbSolvCommented:
To what are you testing?  As others have stated, the tech is likely just testing to a device in their office.  You are likely going beyond the ISP, through the internet, and to some host.  The internet or host could also be limiting your speed.
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leblancAccountingAuthor Commented:
This is a DIA circuit for a corporation. I think it is difficult to get a true line speed as it is going through the Internet. They are testing from my side going through the Internet to their datacenter.
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atlas_shudderedSr. Network EngineerCommented:
No further comment to question.
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