It wasn't specifically mentioned in the changelog of AMD's Radeon Software Adrenalin Edition 18.3.1 drivers but this new release is the first to feature the results of AMD's Project ReSX. Basically, AMD's driver team collaborated with eSports teams and game developers to deliver focused performance improvements.
This goes beyond the typical frames per second benchmarking as the firm also took care of other aspects like reducing input latency and improving 99th percentile frametimes. The goal here is to deliver a better overall gaming experience rather than just higher framerates. AnandTech has some more details over here.
For framerates, AMD cites a 3 – 11% increase for specific resolutions and settings, while 99th percentile frametimes see a 2 – 9% improvement and input lag sees a 4 – 8% reduction. Ultimately, AMD refers to overall “experience” rather than pure framerates, which is especially pertinent to eSports titles that tend to be less graphically intensive but require competitive level responsiveness and frametime consistency. At the same time, as these are some of the most widely played games on the market, this is a very senisble move for AMD to make: they can improve the gaming experience for a very large number of their users all at once with only a modest engineering outlay.