Downloading iSpeed 3.55.215 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. ISpeed.EXE, ispeed3.exe and iSpeedLapAnalyzer.exe are the most frequent filenames for this program's installer.
The following version: 3.5 is the most frequently downloaded one by the program users. We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software. This free software is a product of High Mountain Software. You can launch this free PC program on Windows XP/Vista/7/8/10/11 32-bit. The software lies within System Utilities, more precisely System Optimization.
From the developer:
Will easily allow you to fine tune your TCP/IP parameters tomaximize your throughput for your dialup internet connections. iSpeed has builtin optimal configurations that will set your configurations to those found to provide the greatest throughput on a number of different systems at the click of a button. iSpeed will automagically calculate the optimal values for certain settings based on the values of other settings if desired.
You may want to check out more software, such as i-SPEED Viewer, which might be similar to iSpeed.