MakeTechEasier posted a tutorial about optimizing KDE desktop effects

Since its official inclusion in KDE, the Desktop Effects component of KWin has received mixed reviews. Many of the negative reviews point to performance problems, some of which are the result of the dramatically diverse offering of Linux drivers available for graphics cards.

Not all graphics cards are equal, but one would expect them to perform the same or close to the same on one operating system as they do on another. Unfortunately, the lack of cooperation from some graphics chip manufacturers and the slow development of some open source drivers have created an environment where every user’s experience may be different.

  How to Optimize KDE Desktop Effects