One of the best ways to measure TCP maximum bandwidth is to use the iperf tool, which you can download from here.
Source code is available, and there's executables for Windows XP to Windows 10, Linux x86 and Linux x64, Mac OS X, x86 Solaris and SPARC Solaris.
In 2017, with the release of Delphi 10.2 Tokyo, Embarcadero introduced a specialized implementation of the Observer pattern into the System.Classes unit. While it has been in the wild for 9 years, it remains a "hidden" architecture for many, primarily because it serves as the invisible engine behind LiveBindings. Other than live bindings, you can also use the Observer pattern as a way to update component settings to the Windows registry, an .ini file, or persist it elsewhere.
System.Classes