To check how fast your internet is, Google "internet speed test" and click the blue "Run speed test" button.

The UNIX ping command lets you test network servers and latency. Here's how to use it in the macOS Terminal app. The UNIX ping command is a tiny UNIX network tool that allows you to test your network, ...

You can easily check your Wi-Fi signal's strength, right down to the exact dBm levels, on a Mac or PC computer.