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Variables a and b would be declared as Variant, taking up more memory and CPU time.Instead, the fully correct declaration should look like this: "Has your Excel crashed?It looks like this: It is a pain, if the program gets an error and crashes before it has switched the screen updating back on.

One important thing: Keep in mind to always put comments in your macros.Whenever the content of one single cell changes, Excel makes sure all formulas that might or might not depend on that one are re-calculated.A macro that works directly in cells would trigger that event very often, therefore incurring a lot of possibly unneeded recalculations. if you need the all open workbooks to be recalculated Active Sheet. if you want to recalculate the active sheet Worksheets(your Worksheet).In normal mode Excel will recalculate, if you change a cell value that affects other cell values.This too can steal time, if you run a large application, and it is possible to switch off the automatic calculation: However you must consider, that if automatic calculation is switched off, Excel will not update cell values, so if your macro needs updated cell values, it is necessary to force a recalculation, either for a specific range: "Range("My Range"). Very often you can speed up execution by writing lean code. If you use recorded macros, it is usually possible to increase speed considerably by changing the code slightly.

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