Adjust quality for slow connections
When you are controlling the screen of another computer over the Internet, you can adjust your connection settings to improve the performance. Different VNC servers support different ways to compress the image data to be transmitted to viewer.

The most effective way to reduce the amount of data to be transferred over the network is to reduce the image quality. OS X built-in VNC server allows you to choose between five variants of image quality:

  • Black and white
  • Grayscale
  • Adaptive
    Use this option if your computer is connected to a slower network. Adaptive quality changes depending on network speed.
  • Medium
  • Full

Most VNC servers do not support the quality adjustment, and instead allow you to choose between three levels of color depth:

  • 8 bits per pixel
  • 16 bits per pixel
  • 32 bits per pixel

To change the image quality:

  1. Start a remote control session.

    See Control or observe a single server for detailed information.

  2. Change image quality using the slider to the right of Viewer toolbar.
Note: you don’t have this setting in RDP session.
Related information
Enable Server Scaling
Viewer window reference