Hands-On High Performance Programming with Qt 5

Graphical performance

Generally speaking, a QML application should run reasonably well on supported GPU-accelerated hardware. However, there's no such thing as a program that's too fast, so we will repeat some of the most important guidelines for good graphical performance:

• Do not use opacity—As we know, GPUs do not like transparency and stencils very much! Beware the situation where your designer has done the 2D UI design in Photoshop using several transparent layers out of convenience.

• Do not use clip—Clipping prevents scene graph's batching.
• Do not use Qt Quick Controls 1 on embedded—The performance is too bad, and in Qt 5.12, they even became deprecated. Use Qt Quick Controls 2.

On low-performance hardware without GPU acceleration, ...