I had a similar problem about a year ago which turned out to be a bad/weak internal wifi card. Replaced the hardware card and fixed the problem. Now it is even more strange.
I have 2 almost identical Acer AOA150 zg5 netbooks. I recently noticed a slow download so I checked the speed. Speedtest is good, but download is slow. Without telling a long story, I will just summarize the data from all my tests.
Netbook A (primary use) with Win XP and wi-fi
Speedtest 7.87 mbps dl (rated 6mbps) 1.88 up
actual download from mozilla 89-120 kBps (approx 1mbps)
actual download from cnet download.com 230-250 KBps
Ethernet wire connection
actual download from mozilla same as above (slow)
actual download from cnet download.com 870KBps (good and correct)
Netbook B (spare) with Win XP and wifi
same as Netbook A approx.
Netbook A with Linux live USB and wi-fi
mozilla still slow
cnet download approx 7-8 mbps AS NORMAL
Netbook B with Linux live USB
same as Netbook A more or less.
So to summarize, we have:
1. Both computers with similar hardware get normal speeds with a wired cable.
2. Both computers get normal speeds with wi-fi and linux
3. Both computers get normal speeds with wi-fi and Windows XP **for the speedtest ONLY***
4. Both computers get a severely reduced speed with wi-fi and winxp for ACTUAL file download
5. Mozilla appears to throttle for every case
So, there is only a problem with this combination:
-only windows xp
-only wi-fi connection
-only actual file download (no problem with wifi speed test)
1. Can it be confirmed that mozilla is throttling download speeds?
2. Is there any chance that the servers are throttling to users that report Winxp as the OS? And if so, why only for wi-fi downloads and not for wired downloads? And if not, what else could make the speed test report fast, but the actual download slow, only on wifi with windows xp but not linux, and exactly the same results on two completely separate machines that don't get used the same way (and presumably would not have received the same infections)?
3. I there a place where I can try to download a large file (200+ mb) that is known to give full bandwidth to all downloads without restriction to ISP, browser, OS or other throttle issues for control testing purposes?
The last time this happened (confirmed bad hardware), I could not duplicate the problem with multiple OS, multiple devices, and *could* duplicate the problem with the bad device and different tests. This time is the opposite. Different tests yield different results with the same device, and both devices yield the same results for each test. It does not appear to be machine specific.
Edited by mo713, 01 March 2015 - 05:00 PM.