AppYogi Software has introduced Internet Speed Test 1.0 (http://tinyurl.com/zd9bhzd) for Mac OS X. The menu bar app features a single threaded algorithm to monitor the download and upload speed of your personal computer network.
Internet Speed Test uses a single connection to download the sample files that simulates what is done in everyday online use. It also allows you to see your public IP with Mac address on the Menu Bar.
Internet Speed Test requires Mac OS X 10.9 or later. It costs $4.99 and is available at the Mac App Store in the Utilities category.