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I'm sorry but I haven't a clue where I should post this but help seems the most appropriate! I'm afraid it is  a multiple question with one major one at the centre so to speak. Main question - should multi thread and single thread tests give similar download speeds? Related questions - 1) My understanding of multi versus single thread is questionable at best.  Is single thread  a random file downloaded from a single server, so if that server is overloaded, that could slow down the  'flow' from that server all the way to final destination (ie my computer) thus giving a false impression of the ISPs performance?  2) Does multithread overcome this by literally throwing several random files from random servers across 'the net' so that it is highly unlikely that any reduced final download will be due to server overload and will thus be more likely to demonstrate poor download speeds from the ISP? 3) If single thread tests give a consistent lower speed than multi, does this imply a 'local' problem or just that a different server (source) should be tried? If it's relevant, I'm using a standard Win 10 desktop (or laptop) with Firefox  (or Edge) with a nominal contractual download of £30Mbs (which in practice is varying from near 3 to 29) supplied over a radio network operated by a local ISP (ie not cable or fibre). Similar results arise whichever equipment I use, including the laptop connected direct from the radio antennae (ie by-passing the router and therefore wifi.) Any help or advice on the above will be very much appreciated.

I also tried turning off the XP PC, rebooting my Router and turning off my Phone because I don't know how much bandwidth they are constantly using and affecting the TetMy.net results.   Here are the pictures:   11 W10 Chrome IPTV Running Screenshot 2021-09-16 214125:   12 W10 Chrome IPTV Running Screenshot 2021-09-16 214339:   13 W10 Chrome IPTV Off Screenshot 2021-09-16 214512:   14 W10 Firefox IPTV Off Screenshot 2021-09-16 214807:   15 W10 Chrome IPTV Off XP PC Off, W10 Laptop Off Router Rebooted Screenshot 2021-09-16 215259:   16 W10 Chrome IPTV Off XP PC Off W10 Laptop Off Screenshot 2021-09-16 215534:   17 W10 Chrome IPTV Off XP PC Off W10 Laptop Off Phone Off Screenshot 2021-09-16 215804:   18 W10 Chrome IPTV Off XP PC Off W10 Laptop Off Phone Off Screenshot 2021-09-16 215959:   I also turned of my Windows 10 Laptop as I wasn't sure if it was affecting the results. The IPTV is now working OK. Their own speed test is reporting 15 to 30 Mbps, so they probably sorted out the problem at their end.  

Hi CA3LE,   Sorry for not replying sooner - I missed the last line of your post! I guess I got too involved in sorting out my IPTV/Android box that was playing up.    I had another problem tonight which is why I came back here and re-read your post. For about over an hour my IPTV (server is in "Asia" - don't know where, but probably Singapore) so I've been doing a lot of single-threaded tests to your Singapore server on both my Windows 10 PC and my XP (sorry!) PC. I used both Chrome and Firefox for the tests. I'll post them here in order of testing (the filenames have a timestamp) as the problem was probably changing over time.   I hope you can make head or tails of what was going on!  (And I hope your forum s/w can handle all the pictures!)   1 Windows 10 PC, Chrome:   2 W10, Chrome:   3 W10, Firefox:   4 W10, Firefox:   5 W10, Chrome:   6 XP, Chrome:   7 XP, Chrome:   8 XP, Firefox:   9 XP, Firefox:   10 W10, Chrome:  

I recently got a higher speed from my ISP. I'm now on 200Mbps download & 10Mbps upload. Both computers are dual core but different brands, Both are hard wired with CAT 6A Ethernet cables. I will snow my speeds with Avast Free enabled & disables at it is part of the problem. This is for the Lenovo it's network adapter is a Qualcomm Atheros AR8171/8175 PCI-E Gigabit Ethernet Controller (NDIS 6.20) With Avast enabled :     I cleared my cache & disabled Avast for this test:   This is for the Dell it's network adapter is a Intel(R) 82567LM-3 Gigabit Network Connection. With Avast enabled  :   I cleared my cache & disabled Avast for this test:   1. Do others have this problem with Avast enabled ? 2. Any ideas on why so much difference with the two computers ?