Just looking for an explanation

[ERMEGM]

Huh? Not really sure what you are talking about. Can you elaborate a little more please? Thanks.

[peterdeco1]

I think what Alain means is when you go from 0 to 255, it simply adds 1 to the present number. When it reaches 255 it doesn't do any resetting. It simply adds 1 to 255 and it goes back to 0 itself. On 0 to 150 it has to constantly monitor the number and reset to 0 after 150. This uses more memory. I just learned a lesson from your post myself.

[Demon]

Comparing the generated Assembler code might give more clues.

Robert

[Art]

Yes the generated assembler would be smaller.
An example of two BASIC IF...THEN comparisons in assembler

@ movf		_Variable	,W	'IF Variable = $A0 THEN...
@ sublw		0xA0			'subtract comparison
@ btfss		status		,Z	'test if result is zero
// condition is here

@ movf		_Variable	,W	'IF Variable = $00 THEN...
@ btfss		status		,Z	'test if result is zero
// condition is here

You are always testing for zero, helps if the comparison is zero!