On 2020-02-19 04:38, Paul Thornett wrote:
Unfortunately the problem certainly doesn't lie with my ISP. I say
unfortunately, because it's relatively easy to change ISP.

Your ISP, if it's a national company, have more than just the server
(or whatever it is) that your modem connects to.  They will likely
have an internal network over which they route traffic.

The CDNs you collect files from will be hosted on multiple servers
in someone else's network.

There's also servers between the CDN servers and your ISP's network.

To get an idea of where the bottleneck is, you need to try to pin
down which CDN servers are sending you data - it may vary a lot from
programme to programme, according to how the CDN has decided to
host content.

You also need to know (or have your ISP investigate on your behalf)
what the route between the CDNs and their network is, and once
inside their network what route is used there.

At all stages, the actual servers in use and routes in use can
change from moment to moment.


But my quoted speeds are 100Mbps/40Mbps,

Quoted by whom?


What speeds do you get if you use some of the online speed tests?
(Though note that the servers sending content may actually be
inside your ISP's own network, or traffic from them may be routed
differently from normal traffic.)


What do you get if you try to download large files from other
places?


--
Jeremy Nicoll - my opinions are my own

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