How to Stop ISP Throttling - Bypass ISP Throttling

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How to Limit Any Application’s Bandwidth on Windows

Throttling limits the number of user actions or concurrent calls (by script or code) to prevent overuse of resources. That said, it is rare for a user to get throttled in SharePoint Online. The service is robust, and it is designed to handle high volume. If you do get throttled, 99% of the time it is because of custom code.

Typically, throttling is when your ISP limits your bandwidth after you've reached a preset monthly data cap, but it can also occur when an ISP decides to slow certain online destinations.

What "Bandwidth Throttling" Means and Why ISPs Do It