I have noticed that the IDE is slow to update changes in an InForm program, so does InForm use a lot of CPU?I assume you mean that when you edit a .bas file generated by InForm in the IDE it takes long to indent, capitalize keywords and the like. If that's the case, it has nothing to do with InForm using a lot of CPU at runtime, but with the fact that InForm's core library is made up of a few thousand lines of code, all of which come before your program's custom code (as per the position of the $INCLUDE lines), and the IDE goes through it all before starting on your custom SUB/FUNCTION block.