Reconstruct. This should only be made use of Should you have one dtype for all columns. Otherwise, you can end up getting dtype object for all columns and changing them again calls for extra dictionary work. CowperKettleCowperKettle 36.7k1818 gold badges137137 silver badges235235 bronze badges 2 Took me a while to https://alexisnsrpx.bloggadores.com/35597371/the-smart-trick-of-stack-ball-speed-mode-that-nobody-is-discussing