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You must set the Screen Updating property to True when the procedure finishes or when it stops after an error. Turn off automatic calculations: Whenever content(s) of a cell or range of cells are changed, the formulas dependent on them and Volatile functions are recalculated. You can increase the speed of some procedures by keeping screen updating turned off. We rarely fire an event for each cell we're changing via code. Enable Events to tell VBA processor whether to fire events or not.For example - See these 2 macros When we save the macro, it is virtually compiled and unlike it's human readable form as we saw in VBE(Visual Basic Editor), keywords(the dark blue words which you cannot use as variable) are saved as three-byte token which are faster to process as machine understand them better and variables, comments and literal strings which are not either keyword or directive are saved "as is".However VBA compiler tokenizes the word but it does not compress the lines and each line is maintained as is ending with the 'Carriage Return'.When VB interprets the last line(where we generally sets our objects to Nothing), it will remove the existing reference.At this point, if the object has no more references, the garbage collector will destroy the object and deallocate all its resources.
Reduce the number of Lines: Avoid multiple statements especially when they can be clubbed into one line.
Behind the scenes, VB still makes extensive use of pointers. This little piece of software tries to determine whether or not an object should be destroyed.
There are many ways to implement a garbage collector, but Visual Basic uses what is called the reference count method.
o We modify any of the properties of the Page Setup object in a VBA macro.
Refer to this Microsoft article for more details - Use 'WITH' statement when working with objects: If we have to access an object's properties and methods in several lines, we must avoid using object's name or fully qualified object path again and again.