CPU Usage 12% even though the window is minimized

[Ciantic]

Describe the bug
CPU Usage 12% even though the window is minimized, and no WebViewBuilder in use

Steps To Reproduce

[dependencies]
wry = { git = "https://github.com/tauri-apps/wry", branch = "dev" }

fn main() -> wry::Result<()> {
    use wry::{
        application::{
            event::{Event, StartCause, WindowEvent},
            event_loop::{ControlFlow, EventLoop},
            window::WindowBuilder,
        },
        webview::WebViewBuilder,
    };

    let event_loop = EventLoop::new();
    let window = WindowBuilder::new()
        .with_title("Hello World")
        .build(&event_loop)?;
    // let _webview = WebViewBuilder::new(window)?
    //     .with_url("https://tauri.studio")?
    //     .build()?;

    event_loop.run(move |event, _, control_flow| {
        *control_flow = ControlFlow::Poll;

        match event {
            Event::NewEvents(StartCause::Init) => println!("Wry has started!"),
            Event::WindowEvent {
                event: WindowEvent::CloseRequested,
                ..
            } => *control_flow = ControlFlow::Exit,
            _ => (),
        }
    });
}

Expected behavior
Something considerably less

Screenshots

Platform and Versions (please complete the following information):
OS: Windows 10
Rustc: rustc 1.51.0 (2fd73fabe 2021-03-23)

Would you assign yourself to resolve this bug?

• Yes
• No

This bug maybe related to winit bug rust-windowing/winit#1634 but maybe not, however I think winit should also be fixed, IMO it's unusable with silent reading of mouse and keyboard by default.

[wusyong]

I can reproduce this and also got around 15% CPU usage.
But it can get significantly lower if the control flow is set toControlFlow::Wait.
Even with moving mouse and typing keyboard constantly will only be 1~2%.
I think it's safe to close this issue unless we see any more usage outburst.