I believe the note about performance problems was referring specifically to my benchmark of Pbind vs LazyPbind above. In the other thread, someone had asked “Is there any downside to making LazyPbind the default Pbind?” and I would say that slowing down every Pbind by a factor of 3 would not be a good thing to do casually. There aren’t any other claims about performance being made, as far as I can see.