Can you give a bit more flavor to "not very fast"? I'm on a measly chromebook and scrolling, selecting text, expanding directories, everything is smooth and high framerate.
Is there a specific operation that is not fast? Opening it for the first time took a few seconds but afterwards it was pretty buttery.
Makepad kinda has a minimum GPU spec. It's aging-out for the people who don't have this, but some people still don't have gpu's that can bitblit their screen with a solid color.
(Of course in principle you don't need hardware acceleration to make this kind of thing run fast...)