Analyzing video, especially HD video, requires a powerful computer. For example, displaying two HD video images, blended together and with drawings overlaid, requires good graphics hardware. For this reason we recommend a computer specification which we can be sure will do everything you need it to do and you'll be future-proofed for the lifetime of the computer

That said, if you will be using Dartfish for less resource-hungry analysis tasks, a lower spec may work adequately.