What you need to know
When you run alfaview on a Mac, the fan spins noticeably loudly. The processor is very stressed.
The manufacturer is aware of the situation. A more resource-saving version is in the works!
What you have to do
In the alfaview app, reduce the bandwidth usage under: Settings > Video: Bandwidth usage Screen sharing: reduced.
Set the "Improved video quality" to: off.
Activate the "automatic change of graphics modes" in the System Preferences of your Mac under "Power Saving.