Why does QVideoWidget lag when resizing with QSplitter

[Saviz]

In my UI form, I have a QSplitter configured in a horizontal orientation, comprising two child elements: a QWidget promoted to a QVideoWidget and a QLabel on the opposite side. When the QSplitter does not contain a QVideoWidget, it demonstrates responsive behavior and smooth resizing when the handler is dragged quickly. However, when I introduce a QVideoWidget into the splitter, it experiences significant lag and behaves poorly. This is true even if the QVideoWidget is not displaying anything and is just a black screen. I am using Qt version 6.6.1 on a 64-bit Windows 10 operating system. Any insights into the cause of this issue and suggestions for resolution would be appreciated.