Way too slow

I have had this calculator app for several years now... I can tell you that the single most important bug, or design flaw, still hasnt been fixed.

The problem: when inputting numbers, the app consistently misses inputs, usually when youre entering the second set of numbers after "-,+,/,x. I actually paid for this app and feel like it is broken, and has been since day one.

jw871 about powerOne Finance Pro, v4.1.7