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Capturing window thmubnails is expensive as it actually uses the window capturer and it records one full frame per window and then downscale to the default size 150x150. When only interested in the window names or the app icons we do not need all of this. Underlying change is merged in chromium72 so this patch only modifies the doc, see: https://chromium.googlesource.com/chromium/src.git/+log/72.0.3626.52/chrome/browser/media/webrtc/native_desktop_media_list.cc Example: desktopCapturer.getSources({thumbnailSize: {width: 0, height: 0}}, ...) Also added a unit test in spec/api-desktop-capturer-spec.js that verifies that the returned thumbails are of type NativeImage and empty, when the user disable fetching thumbnails. notes: Can disable fetching the thumbnails for the DesktopCapturer. https://github.com/electron/electron/issues/14872