With its popularity, the question may have already been answered.
To use this soft-synth, you need the following specs on your computer at the bare minimum:
It is one of the most powerful synths on the market today and is very CPU efficient as well. Sylenth1 is a virtual instrument (synthesizer) that uses additive synthesis to generate sounds. You can see AVICII use Sylenth and Martin Garrix use the synthesizer too. It has been a major player in Electronic Dance Music (EDM) production for a long time and still is a great choice to this day. Sylenth1 (often called Sylenth) has been a long-standing, go-to plugin for many producers including some of the biggest DJs from around the world.