Unexpected behavior in downloading files with Postman and Bandwidth control

I have also posted this question on Stackoverflow: netflix - Unexpected behavior in downloading files with Postman and Bandwidth control - Stack Overflow

I hope everyone is fine. I’m experiencing different behavior and don’t know where can be the issue. I’m trying to measure the download time by limiting the bandwidth in the router Tplink TL-WR840N. I’ve set the bandwidth of the system to 1 Megabit per second. My file size is 25.13 Mega Bytes. I have confirmed the bandwidth using the Netflix fast.com service. Internet speed is shown:

My Postman request is shown as follows:

As you can see from the Postman request that I got the response in 2.5 seconds which is theoretically speaking is wrong. File downloading time should be `~ 3 minutes 25 seconds. Is there anything I’m missing in the calculation?