Not such great news unfortunately! The PC was fine for about 24 hours and then I did a large upload - about 1GB. After that, it was back to its impossibly slow self once again. The upload went well,...

OK, thanks for all replies once again. I appreciate the trouble people have gone to in order to help.

Yes, BIOS is up to date, and I did try running the commands you kindly suggested.

I think...

Thanks again for the comments.

I have installed Samsung Magician and run a performance benchmark on the SSD (C drive). The results were 508MB/s read and 250Mb/s write - which I think is OK....

Thanks again for the comments.

I have attached a couple of interesting graphs - CPU activity and Disk C activity during a very slow internet download via Firefox. To do this, I have to open Task...

Once again, thanks for all the replies - the help is appreciated.

Having said earlier that the slow internet speed slowly crept back into being, the characteristics of the problem do seem to have...

OK, the slow speed returned gradually. It seems that the more I download, the more the internet speed slows. Yesterday, the speed had reduced quite a bit but the internet was still useable. I then...

Thanks again.

I discovered that if I use the command "nbtstat - RR" I get a result (- which I do not understand). Note that I used a space on either side of the RR characters. The result is...

Thank you very much for your reply. I appreciate your help.

Uninstalling all AV made no perceptible difference. I do not have any performance/3rd party cleaners installed other than CCleaner....

I am having currenly insoluble problems with slow internet on Windows 10. My computer is fine when not using a browser. These problems extend back several months during which time I have struggled to...