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If you have macOS Monterey or later in your system, here is how you can test Internet speed:-

1. Go to Terminal
2. Type networkQuality -v and Press Enter

You will see internet speed test running inside your terminal & returning the result within a minute.

Sample Output:-

==== SUMMARY ====                                                                                         
Upload capacity: 18.856 Mbps
Download capacity: 98.696 Mbps
Upload flows: 20
Download flows: 12
Responsiveness: Low (121 RPM)
Base RTT: 273
Start: 28/11/21, 1:06:09 AM
End: 28/11/21, 1:06:28 AM
OS Version: Version 12.0.1 (Build XXXXXX)

(Source: https://support.apple.com/en-gb/HT212313)

If you have macOS Monterey or later in your system, here is how you can test Internet speed:-

1. Go to Terminal
2. Type networkQuality -v and Press Enter

You will see internet speed test running inside your terminal & returning the result within a minute.

Sample Output:-

==== SUMMARY ====                                                                                         
Upload capacity: 18.856 Mbps
Download capacity: 98.696 Mbps
Upload flows: 20
Download flows: 12
Responsiveness: Low (121 RPM)
Base RTT: 273
Start: 28/11/21, 1:06:09 AM
End: 28/11/21, 1:06:28 AM
OS Version: Version 12.0.1 (Build XXXXXX)

(Source: https://support.apple.com/en-gb/HT212313)

UPDATED:- In case you are willing to test in earlier versions of macOS, just run the following in your terminal.

curl -s https://raw.githubusercontent.com/sivel/speedtest-cli/master/speedtest.py | python -

If you have macOS Monterey or later in your system, here is how you can test Internet speed:-

1. Go to Terminal
2. Type networkQuality -v and Press Enter

You will see internet speed test running inside your terminal & returning the result within a minute.

Sample Output:-

==== SUMMARY ====                                                                                         
Upload capacity: 18.856 Mbps
Download capacity: 98.696 Mbps
Upload flows: 20
Download flows: 12
Responsiveness: Low (121 RPM)
Base RTT: 273
Start: 28/11/21, 1:06:09 AM
End: 28/11/21, 1:06:28 AM
OS Version: Version 12.0.1 (Build XXXXXX)

Let me know if this works for you ;)

(Source: https://support.apple.com/en-gb/HT212313)

If you have macOS Monterey or later in your system, here is how you can test Internet speed:-

1. Go to Terminal
2. Type networkQuality -v and Press Enter

You will see internet speed test running inside your terminal & returning the result within a minute.

Sample Output:-

==== SUMMARY ====                                                                                         
Upload capacity: 18.856 Mbps
Download capacity: 98.696 Mbps
Upload flows: 20
Download flows: 12
Responsiveness: Low (121 RPM)
Base RTT: 273
Start: 28/11/21, 1:06:09 AM
End: 28/11/21, 1:06:28 AM
OS Version: Version 12.0.1 (Build XXXXXX)

(Source: https://support.apple.com/en-gb/HT212313)

If you have macOS Monterey or later in your system, here is how you can test Internet speed:-

1. Go to Terminal
2. Type networkQuality -v and Press Enter

You will see internet speed test running inside your terminal & returning the result within a minute.

Sample Output:-

==== SUMMARY ====                                                                                         
Upload capacity: 18.856 Mbps
Download capacity: 98.696 Mbps
Upload flows: 20
Download flows: 12
Responsiveness: Low (121 RPM)
Base RTT: 273
Start: 28/11/21, 1:06:09 AM
End: 28/11/21, 1:06:28 AM
OS Version: Version 12.0.1 (Build XXXXXX)

Let me know if this works for you ;)

If you have macOS Monterey or later in your system, here is how you can test Internet speed:-

1. Go to Terminal
2. Type networkQuality -v and Press Enter

You will see internet speed test running inside your terminal & returning the result within a minute.

Sample Output:-

==== SUMMARY ====                                                                                         
Upload capacity: 18.856 Mbps
Download capacity: 98.696 Mbps
Upload flows: 20
Download flows: 12
Responsiveness: Low (121 RPM)
Base RTT: 273
Start: 28/11/21, 1:06:09 AM
End: 28/11/21, 1:06:28 AM
OS Version: Version 12.0.1 (Build XXXXXX)

Let me know if this works for you ;)

(Source: https://support.apple.com/en-gb/HT212313)