Heavy latency when main window is hidden in Sway WM

[ValiantMaverick]

Tested versions

Reproducible in 26.1 stable and current master branch as of this posting

System information

Fedora atomic derivative using SwayWM and xwayland, recent (<5 years) AMD CPU and GPU

Issue description

When the main editor window is not rendered, any secondary windows such as settings dialogs have a very high latency. This is most noticeable when trying to type in a text box, but can be observed by clicking other controls as well.

Steps to reproduce

The issue appears to occur any time the main editor window is not rendered. There are at least two methods that work to reproduce this:

1. Open Redot editor in a tabbed Sway container and open any dialog, covering the main editor window completely.
2. Open Redot editor normally, open a dialog, then move said dialog to another workspace and switch to that workspace, leaving the main editor out of view.
3. Open Redot editor in a tabbed Sway container with another item such as a terminal. Open any dialog and move it out of the tabbed container. Switch the tabbed container to another item, covering up the main editor window.

With method 3, you can bring the editor back to the front of the tabbed container to demonstrate that the bug does not occur when the main window is in view.

Minimal reproduction project (MRP)

N/A - use any project or an empty project

[Arctis-Fireblight]

Does this issue still occur if you enable "Prefer Wayland" in the Editor settings?

[Arctis-Fireblight]

Reading through the documentation, this also might not be a bug per say.
Can you please check the "Unfocused Low Processor Mode Sleep" setting under Editor Settings?

The default is to reduce the frame rate of the editor to 10FPS if it is minimized or unfocused, to not kill the battery or performance on lower spec'ed devices such as laptops when it is running in the background.

This behavior can be overridden by enabling the "Update Continuously" setting pictured at the bottom of the above screenshot.

[ValiantMaverick]

Enabling "Prefer Wayland" appears to alleviate the issue for Sway. "Update Continuously" does not, nor does reducing the unfocused low processor mode sleep to subframe values.