Continuous Speed Test Tool - FAQ

Why do I get results different from other tools?

There are few reasons why you get different results using our tool and other tools like ookla, netflix

What should be limits for 400mb/s download and 25 Mb/s upload ISP test?

My ISP says they are delivering 400mb/s download and 25 Mb/s upload. When running the CST what should my initial test settings be? Download upload limits.
It can be 100Mbps download limit and 25Mbps upload limit. I have very big doubt that an ISP really provides 400Mbps internet speed to remotely located servers. They usually host ookla speedtest servers inside their own local network to provide fast 400Mbps speed test results at

What is your recommended path for showing the (bad) results of internet speed test?

I’d like to catch Comcast / Xfinity in the process of giving me less than I paid for internet services... I have been paying for 1Gbps and I constantly get 100-200Mbps when measuring against (and this correlates to my horrible streaming from any video providers other than Comcast ) - and when I call comcast they continually refer me to Oookla - which I believe they invested into? And its an impartial test where they are just showing speed to their own kit...
I want to show them what I am experiencing as losses from all services outside their own... (built by Netflix) seems to show the reality...
What is your recommended path for showing them this? I can run your kit continually on a self contained service in my network - but are there any recommendations you can give for better result that can pinpoint the issue?
It is strange because 100Mbps should be enough for any video streaming service. I want to show them what I am experiencing as losses from all services outside their own. - I think they already know that. It is a hidden thing inside ISP business, the speed depends on server that you use. It is very cheap for an ISP to use their internal servers. The more important question is: does your contract with your ISP (Comcast/Xfinity) contain anything about "how the internet speed (that they claim) is measured"?
And about Ookla - no, they don't invest into ookla (I thikn), they just host ookla speed test servers inside their own network, that's why ookla speed test results are super good.
What you also can do - host our CST tool on your own linux server (with guaranteed bandwidth) somewhere in another country and run a test between your home and your own server, save results to CSV and send them the test results.

What are common reasons of bad internet quality?

How to solve internet quality issues?

In our experience these things really helped:

Extremely high upload packet loss

How should I interpret the results? My test (using the Easy, for users tab) shows that the Upload has extremely high packet loss - only occasionally less than 40% and usually 100%, and my question is what does this mean? My troubles with my ISP appear to me to be on the Upload side. There is enormous latency in making an Upload connection. So much so that most vanilla internet speed tests (and lots of other apps) actually time out and report "no internet connection" faults.

Yes, it looks like there is a problem with upload direction. One thing I would try - change network adapter. If you use wifi, can you try wired connection (LAN, ethernet)? It can help to clarify situation - is it ISP's or adapter's issue.

Is packet loss value = 0% good or not?

What if the the "Packet Loss" column says "0.00%" - do we have good signal or vice versa?

Yes, packet loss of 0% is perfect result. Normally in internet there can be small packet loss below 1%, and peak packet loss below 3%. Higher packet loss means congestion in upstream or downstream data channels, in internet provider, or in WiFi/4G/LTE routers

What does it mean if RTT/ping column varies from 10s to 100s?

It means that round trip delay (RTT) is too high. It means that packets are stored in routers in queue for such long time, and it means too long delays between client and server

How do I translate the results into something my ISP can fix?

For about a month now my ISP has been horrible, I've had so many calls to tech support it's not even funny. I'm a very technical person and have designed networks and the like for years now.. here is my dilemma.
Every night about 9PM to 12AM my bandwidth drops from 10Mbps (which is what I pay for) to anywhere from 3Mbps to 8Mbps and specifically Twitch video streaming (not upload, just watching live streams) suffers so bad it's pointless to even watch.
I attributed this to them not having enough bandwidth to my tower (they are a WISP) and they said they would do something about it, but honestly I don't think they know what the heck is wrong at this point and its VERY frustrating considering they are the only ISP I can get where I am at.
I would perform ping tests even when the bandwidth dipped down to 3Mbps and would only see about 1% loss here and there, nothing to bawk about.. until I found your tool..
Running your tool even set to 4Mbps target I get 10% loss and constant "down" statuses even when I'm not using my connection. How do I translate this into something my ISP can fix?
I'm using an Edge Router X router, but I've bypassed it before directly to hook into their Ubiquiti PowerBeam antenna on my roof, and it doesn't make a difference with or without my equipment hooked to theirs. I'm very familiar with UBNT equipment as I install it for my customers.
What can be done?

Before further investigation can you confirm (and maybe send screenshot) proving that it is ok at some small bandwidth (lets say 1Mbps)? To make sure that the results can be good in your environment?

Please run the CST test at 1Mbps, and at same time run trace route tool (tracert.exe), Windows command line "tracert.exe". After that, increase CST target bandwidth gradually, and see at which point CST results get bad (above 10% packet loss). Then see difference in tracert results and see which IP address (hop) gets bad quality - it will show to your ISP where internet connection gets bad, where they have overload. Then send it to your ISP (if they are willing to talk to you and listen). They should investigate what happens at that hop, which other customers suffer too, and probably replace their hardware or reconfigure it.

How to uninstall the program?

Please use Windows Control Panel - Programs, or just delete directory with the continuous speed test program. It does not store any files in other directories.
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