Faster ways to render image - very slow

[vortex314]

I've created a dashboard that besides metrics also display live camera images, collected via an ESP32 microcontroller camera.
However rendering an image of 100kb take about 1 sec to render. Is there a faster way to do so ?
I didn't find any way besides creating a texture . This however freezes most of the time the dashboard as these images arrive 10 fps.

fn decode_bytes_to_texture(
    ctx: &egui::Context,
    data: &Vec<u8>,
) -> Result<egui::TextureHandle> {
    let image = ImageReader::new(Cursor::new(data))
        .with_guessed_format()?
        .decode()?;
    // Convert the image to RGBA
    let image_rgba = image.to_rgba8();

    // Upload the image to the GPU as a texture
    let texture = ctx.load_texture(
        "my_texture",
        egui::ColorImage::from_rgba_unmultiplied(
            [image_rgba.width() as usize, image_rgba.height() as usize],
            &image_rgba,
        ),
        Default::default(),
    );
    Ok(texture)
}


fn show(&mut self, ui: &mut egui::Ui) -> UiResponse {
        let start_time = Instant::now();

        if self.data.is_none() {
            return UiResponse::None;
        }
        // Decode the JPEG data into an egui texture
        if let Some(data) = self.data.as_ref() {
            info!("ImageWidget rendering image [{}]", data.len());
            self.texture = decode_bytes_to_texture(ui.ctx(), data).ok();
        }
        if let Some(texture) = self.texture.as_ref() {
            // Display the image
            ui.image((texture.id(), ui.available_size()));
        } else {
            ui.label("Failed to decode image.");
        }
        let elapsed = start_time.elapsed();
        info!("ImageWidget rendered in {:?}", elapsed);

        UiResponse::None
    }

[17:20:13.914] INFO tokio-runt | mod.rs      :395|  Processed value src/cam1/camera [108398] to widget 
[17:20:13.915] INFO tokio-runt | image_widget:105|  ImageWidget received image data [108398]
[17:20:13.918] INFO tokio-runt | mod.rs      :395|  Processed value src/cam1/camera [108634] to widget 
[17:20:13.918] INFO tokio-runt | image_widget:105|  ImageWidget received image data [108634]
[17:20:13.922] INFO main       | image_widget: 83|  ImageWidget rendering image [108634]
[17:20:14.975] INFO main       | image_widget: 93|  ImageWidget rendered in 1.052711977s```

[vortex314]

The first resolution was : FRAMESIZE_UXGA, // 1600x1200 => took 1 sec to render
The second resolution was : FRAMESIZE_VGA, // 640x480 => takes 170 msec
Even the 170 msec , creates an annoying user experience.

[19:42:48.692] INFO main       | image_widget: 60|  ImageReader::new takes 99.875988ms
[19:42:48.728] INFO main       | image_widget: 63|  image.to_rgba8 takes 136.00374ms
[19:42:48.761] INFO main       | image_widget: 73|  ctx.load_texture takes 169.320559ms
[19:42:48.761] INFO main       | image_widget: 87|  decode_bytes_to_texture takes 169.435767ms
[19:42:48.761] INFO main       | image_widget: 98|  ImageWidget rendered in 169.525077ms