Why Netflix's speed tester reports different numbers than Ookla, how ISP CDN throttling plays a role, and which test…
High-resolution video streaming consumes massive amounts of ISP backbone bandwidth. To prevent their local nodes from saturating, many ISPs enforce a…
Why can Ookla show 250 Mbps while Fast.com shows only 15 Mbps at the same moment?
Ookla's traffic isn't recognized as video streaming and gets full bandwidth, while Fast.com's traffic looks exactly like Netflix 4K playback to the ISP…
The fundamental difference between the two platforms lies in **where the testing files are hosted** and **which ports are used**:
How can I confirm my ISP is throttling video traffic specifically?
Run Fast.com and record the result, then connect a VPN like NordVPN or ExpressVPN and run Fast.com again — if the number jumps (e.g., from 15 Mbps to 180…
Fast.com is owned and operated by Netflix. To run the test, Fast.com downloads dummy media files directly from **Netflix's global Open Connect CDNs** (Content…
Which test should I trust for my line's true maximum physical speed?
Ookla's Speedtest.net, since it reveals your maximum physical port speed; Fast.com instead reveals your real, throttled video-streaming capacity — the two…
Ookla operates a federated network of over 10,000 localized speed test servers hosted by ISPs, telecom operators, and host providers. When you click test, it…
Why does Fast.com often show much lower speeds than Ookla? The culprit is **ISP video throttling**.
Neither is "wrong" — they are simply measuring two completely different aspects of your connection:
To verify if your ISP is actively throttling your streaming speed, run a simple diagnostic test:
Why Netflix's speed tester reports different numbers than Ookla, how ISP CDN throttling plays a role, and which test to trust.
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