Obviously it's going to have some performance impact, nothing is free - however as processors have become more powerful, the impacts become negligible in many situations. Look at Anisotropic filtering on GPUs - 15 years ago increasing AF to 16x would cause your FPS to drop, but almost any GPU from the 600 series onwards can max out their AF with no performance impact. Likewise with CPU progress, you reach a point where certain operations become efficient enough that their impacts are negligible. We're not quite there yet with compression, but we're pretty close. Also, note that Windows 10 applies OS level compression by default on some low-capacity SSDs (you can check your status by typing "compact.exe /compactOs" into CMD or Powershell. It wouldn't make sense for Windows to do this if there was going to be a significant performance hit, especially since this compression mostly applies to low-power, low-space hybrid devices. If you want some benchmarks, have a look at these (sadly some of these didn't do FPS comparisons which are more important than load comparisons :/) Fortnite ARMA 3 (there are framerate comparisons a bit further down) CSGO Rising Storm 2 I've done some more testing with a few games, but it takes time (which I don't have at the moment) to do proper benchmarks and create analyses of the results - for the most part, I'm relying on user feedback for games that show issues (most of these seem to be games that store themselves in one file like Guild Wars 2) but there haven't been many complaints of performance loss.