What problem does this solve or what need does it fill?

Current the FpsOverlayPlugin has a very short update interval, like the video below:

Of course we can see that it's approximately 59 fps, because it a relatively stable frame rate. But sometimes we may have some unstable frame rate that may fluctuate from 30+ FPS to 40+ FPS where we can hardly say what the specific frame rate is(I just met this problem recently, and I may add a video example of that if I am available tomorrow).

What solution would you like?

Add interval (or other name, I am not good at naming) field, and the FPS displayed will be the average fps of the past interval duration.

App::new()
        .add_plugins((DefaultPlugins, FpsOverlayPlugin {
            config: FpsOverlayConfig {
                interval: bevy::utils::Duration::from_millis(200),
                ..default()
            },
        }))
        .add_systems(Startup, setup)
        .run();

What alternative(s) have you considered?

• Write a simple fps overlay plugin myself
• Use MSI Afterburner or Xbox Game Bar