Sadly the fast and smooth renderer wasn't taken. So last I tested, mainline v1.1 is still not able to work with big models. Try loading the full Voron 3D printer step file.

This fast renderer also closes and add hashed faces to cross sections views, instead of showing some buggy view of the inverts faces of the model.

Furthermore, the sketcher since mainline v1 is very laggy. Every click lags because its trying to draw the dimensions while you move them around but it's somehow slow and irritably laggy.

Finally in general, mainline also plenty of weird UI jitter and flicker. As if some code is fighting to resize elements back and forth during use.

Oh and the pie menu also wasn't copied either. On the realthunder fork a double press on "g" brings a menu under the mouse that quickly list the geometry near the cursor sorted by type, highlighting it as you hover on the selection. This is fantastic because of how bad freecad is at guessing what you are trying to select.

But mainline got a new color scheme and torturously slow UI animations that cannot be fully be disabled. This shows where are the priorities in my opinion.

To finish on a note of hope, at least I have noticed more open source projects using freecad rather than proprietary alternatives lately.

Realthunder also lets the sketchers use projected geometry as real geometry, rather than only as construction geometry. And automatically creates shapebinders, which is very convenient. I still prefer it, but 1.0 works better with add-on toolboxes like Lattice2.