but it's just an empty form.
We're talking
lcl-fpgui (Lazarus' widgetset) here... That's maybe what it looks like to the end user. But a LOT is happening under the hood. The native backend API is initialized, the event loop is established, requests are made to create a window, rendering has to occur (yes, even a empty window is something that must be rendered) etc etc. :-)
But as I explained in the bug report,
lcl-fpgui is not something I maintain, and you'll have to file a Lazuras bug report for that.