Differing speed test results

Last week I did a speed test on my FTTC 60/20Mbps broadband using speedtest.net and I got a download speed of 24Mbps which sort of worried me, thinking that my ISP has reduced my speed because of Covid-19 but then I did a test using fast.com and it showed my speed as 64Mbps.
I have done a few other speed tests on other sites and this is the downloads they give me:
mybroadbandspeed.co.uk 64Mbps
thinkbroadband.co.uk 43Mbps
uswitch.com 55Mbps

I'm on a desktop pc connected using ethernet cable on latest Firefox browser.
I have also tested using Chrome and Edge with nearly the same results.
Is there something wrong with my router, pc, or maybe speedtest.net?
BTW I am getting 64Mbps on WIFI all the time
Thanks for any advice.

"BTW I am getting 64Mbps on WIFI all the time" What is saying you are getting 64 Mbps all the time?

A link to the thinkbroadband test might be useful since the graphs can hold more info than just the single figure.

Reasons for difference may be a mixture of maths and variable performance of the connection

Hi Mr Saffron,

How do I link the test?

Is this it?

https://www.thinkbroadband.com/speedtest/15867670765...

MrSaffron,

Sorry missed the first part of your question.

I'm using the WIFI on my iphone of course not on my pc and the speeds are usually between 55 and 64Mbps.

The graphs are not pretty, very few samples and fairly high latency.

How is the PC connected via an Ethernet cable or its own wireless,

The same speed test will also run on your phone in the browser, so doing that would be a comparison. If the phone gives better looking graphs e.g. https://www.thinkbroadband.com/speedtest/15867161275... which is similar speeds but notice how once test reaches top speed it stays there and the graphs have a lot more data points.

So if phone gives decent graphs you might be looking at a slow PC, or poor wireless card in the PC e.g. 802.11n only or something is busy using the CPU on the PC e.g. anti virus scan slowing it down.

Speed test on my iPhone is 63Mbps

https://www.thinkbroadband.com/speedtest/15867734938...

I’m connected via Ethernet on my computer

I think maybe there’s a problem with the network card.
I haven’t got WiFi on it.

So the speeds are good/as expected using your iPhone ?

Then the issue seems likely to be due to something with the desktop itself. Antivirus software maybe ?

In reply to a post by ukmexicano:

I’m connected via Ethernet on my computer

What is the computer? Windows (10, 8, 7) or Mac ?
Do you have another Ethernet cable you could swap to see if the cable is faulty?

Windows 10 pro with latest updates . Using windows defender No other av

Ethernet cable swapped Friday with same results

Btw upload speed is ok at around 16Mbps That hasn’t dropped it’s still within the 20Mbps limit The only problem is the download speed

Edited by deleted (Mon 13-Apr-20 12:37:43)

ukmexicano

Have you got Onedrive, Google Docs, BT Cloud, other remote backup storage etc. It looks like your PC is doing something else while you are testing. (Even being logged into Google or Microsoft can effect the speed as they have a horrible tendency to track everything you do. ( Likewise Alexa, Siro, Cortana etc)

Planet hunters or other volunteer search programs will also have the same effect.