Create multi OffScreen ChromiumWebBrowser with different URL, the fps will less than i set.

[dxh-sc]

Hi everybody,

I created multi OffScreen ChromiumWebBrowser with different URL, each ChromiumWebBrowser render the image, then will send the image to another server, but i found the render fps less than i set, any idea that i can keep right fps when rendering?

1. one OffScreen ChromiumWebBrowser, i have right fps.
2. two OffScreen ChromiumWebBrowser, i have right fps.
3. three OffScreen ChromiumWebBrowser, the fps will less fps, probably only half of it(formatInfo.FrameRate * 0.5)
4. four OffScreen ChromiumWebBrowser, the fps will less fps, probably only half of it(formatInfo.FrameRate * 0.5)
5. didn't test more.

This is my key code:

example the formatInfo.FrameRate is 25, formatInfo.Width: 1920, formatInfo.Height: 1080

var settings = new CefSettings
{
    // Off-screen rendering core configuration
    WindowlessRenderingEnabled = true,
    // Disable unnecessary log output (improves performance, reduces IO)
    LogSeverity = LogSeverity.Disable,
    // Ignore certificate errors (decide whether to keep based on actual scenario)
    IgnoreCertificateErrors = true,
    // Disable external message pump (recommended for off-screen rendering)
    ExternalMessagePump = false,
    // Set cache path (avoid rebuilding cache on every startup)
    CachePath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "NDIProvider", "cef_cache"),
    MultiThreadedMessageLoop = true
};

// Apply best performance parameters for off-screen rendering
settings.SetOffScreenRenderingBestPerformanceArgs();

// Initialize CEF
return Cef.Initialize(settings, performDependencyCheck: false, browserProcessHandler: null);

int frameRate = formatInfo.FrameRate;
var browserSettings = new BrowserSettings(true)
{
    WindowlessFrameRate = frameRate,
    BackgroundColor = (uint)Color.Transparent.ToArgb()
};

var requestContextSettings = new RequestContextSettings
{
    CachePath = GetCachePath(),
};

var requestContext = new RequestContext(requestContextSettings);
_browser = new ChromiumWebBrowser(url, browserSettings, requestContext)
{
    Size = new Size(formatInfo.Width, formatInfo.Height),
};

await WaitInitAsync(_browser);
_browser.Paint += BrowserOnPaint;
_browser.LoadError += _browser_LoadError;