High CPU usage when showing screen contents

[helmutg]

When enabling "Show Screen Contents" (default enabled), wdisplays causes high CPU usage. It is actually distributed to wdisplays and sway both of which permanently consume about half a CPU (but not several). Disabling "Show Screen Contents" signifcantly reduces the consumption.

I guess that the preview is updated as fast as possible in a less than optimal way. Would it be possible to find compromises here?

• Limit the update rate to reduce CPU usage
• Offer an option to show the initial screen contents and never update them essentially treating them as a screenshot
• Figure out why this is so inefficient when combined with sway

This behavior is reproducible on both Debian bookworm and trixie on amd64 using

• wdisplays/1.1-1 and sway/1.7-6
• wdisplays/1.1.1-1 and sway/1.10.1-2

[mlaga97]

I am also having this issue. I submitted #33 as a workaround to at least be able to save the setting for "Show Screen Contents" rather than having to manually disable it every time.