I just popped together a stack using your code and 2 versions of an image.

I made 2 buttons:

'COMPARE' contained your code
'COMPARE 2' contained your code with all references to your progress bar removed

I also introduced 2 extra flds; 'Stime' and 'Etime'

In both COMPARE and COMPARE 2 I inserted the following lines:

COMPARE

ON mouseUp
put the time into fld "Stime"
   put 0 into c
   set the startvalue of scrollbar Progress to 0
set the endvalue of scrollbar Progress to the length of imagedata of image "Alpha"
   put the imagedata of image "Alpha" into idataalpha
   put the imagedata of image "Beta" into idatabeta
   REPEAT FOR each char myChar in idataalpha
       set the thumbposition of scrollbar Progress to c
       IF myChar is not  char (c) of idatabeta THEN
           put c && char (c) of idatabeta & return after hAll
       END IF
       put c+1 into c
   END repeat
   put hAll into field "diff"
put the time into fld "Etime"
END mouseUp

COMPARE 2

ON mouseUp
put the time into fld "Stime"
   put 0 into c
   put the imagedata of image "Alpha" into idataalpha
   put the imagedata of image "Beta" into idatabeta
   REPEAT FOR each char myChar in idataalpha
       IF myChar is not  char (c) of idatabeta THEN
           put c && char (c) of idatabeta & return after hAll
       END IF
       put c+1 into c
   END repeat
   put hAll into field "diff"
put the time into fld "Etime"
END mouseUp

running the script in btn COMPARE 2 the script took less than a minute

running the script in btn COMPARE is taking so long while I am writing this that I
am getting cheesed-off and I am going to abort the thing.

The problem is your progress bar: get rid of it!


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