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The answer is the usual "it depends" :)

If you capture traffic on your PC while you have the issue you MAY see some errors or issues relating to TCP like retransmissions or window size of zero.

If your TCP traffic does not show "errors" or if your traffic is UDP then there is little you can check for to see if your ISP is throttling your connection.

Throttling happens on the ISP's network after the packets leave your PC.

You also need to keep in mind the issue may be on another part of the Internet and not just on your ISP's network. If your path TO or FROM Twitch has issue then your ISP can't possibly fix something outside their network. They can ask nicely if they have any sort of account with the affected party.

Big enough ISP probably peer with Twitch so they have a direct connection to them. If that link is not "big enough" during peak hours than it may fell like you are being throttled although you should experience packet loss that translate in lag or lost frames in your video.

Hope this helps.

Cheers,

JFD

The answer is the usual "it depends" :)

If you capture traffic on your PC while you have the issue you MAY see some errors or issues relating to TCP like retransmissions or window size of zero.

If your TCP traffic does not show "errors" or if your traffic is UDP then there is little you can check for to see if your ISP is throttling your connection.

Throttling happens on the ISP's network after the packets leave your PC.

You also need to keep in mind the issue may be on another part of the Internet and not just on your ISP's network. If your path TO or FROM Twitch has issue issues then your ISP can't possibly fix something outside their network. They can ask nicely if they have any sort of account with the affected party.

Big enough ISP probably peer with Twitch so they have a direct connection to them. If that link is not "big enough" during peak hours than it may fell like you are being throttled although you should experience packet loss that translate in lag or lost frames in your video.

Hope this helps.

Cheers,

JFD