How to update the window only when input received

[ThomasAlban]

Is it possible to make Bevy only update the window when inputs such as moving the mouse or clicking are received? I'm making a 3d editor using Bevy and it is currently consuming lots of CPU even when running in the background. If not, what other steps can I take to reduce CPU consumption?

[alice-i-cecile]

You want UpdateMode::ReactiveLowPower. This was added by the Foresight team, who are making a CAD application in Bevy so their use case is very similar.

I also recommend pairing this with bevy_framepace to smooth out input latency :)

[ThomasAlban]

Thanks for this, this is exactly what I need. Do you recommend using ReactiveLowPower when the window is unfocused and using Continuous when it is focused? I tried using ReactiveLowPower all the time but since I'm using a WASD controlled camera, holding a key doesn't count as an update so the window would not update while moving.

[alice-i-cecile]

Hmm, that's a good question. I would start with that.