selected preview and speed differences

Well i’t’s showing clearly now that my pc is no war machine:)
I’m rather happy with the global performances though.

Yes, I have to look out for what’s already open.
Actually, what’s in the current viewport from where I launch the preview window has a heavy impact on fps. If I show all my bp code at once in a bloaty Even Graph, fps drops down to 17 ! If I show an empty part of the same tab, my fps remains ok.
In the case of the Level Editor Viewport, I gained 25 more fps, by setting the Editor interface to Unlit…

I’m not sure what you mean. I coded the scalabilities that I wanted to keep still. I did not put my nose in the .ini files yet.

Oh I see. I’ll check that.