Unusable on the fly!

Apple programmers have "upgraded" Numbers to the point, now, where it is unusable on the fly. It is both unresponsive and delayed in receiving input much like old PCs were over a decade ago; my input goes into a buffer and later, sporadically populates the screen. This is true for my iPads 4, Mini, and Air. Note that now the Numbers on my non-upgradable iPad 1 is the best version - although it cannot sync with my other tablets. Bad decisions have been made by Apple on this app. Perhaps I need download Excel for iPad???

Godzillllllla about Numbers, v2.6.1