[PyGame] My program is very laggy

[nilamo]

I made up two random images (I don't think it would matter what they look like, unless they're massive), and didn't notice any lag at all.  Unrelated, but is there a reason you're using pygame.display.update() instead of pygame.display.flip()?

Scaling the images could be a major time sink.  I'd try either a) lower resolution images, and b) a different format such as jpg.

I ran it through the profiler, and got the following output:

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Output:
D:\Projects\playground>python -m cProfile -s tottime eggs.py
         302653 function calls (296917 primitive calls) in 5.433 seconds

   Ordered by: internal time

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
      270    1.506    0.006    1.506    0.006 {method 'tick' of 'Clock' objects}
      540    1.312    0.002    1.312    0.002 {built-in method pygame.transform.scale}
      540    1.093    0.002    1.093    0.002 {method 'blit' of 'pygame.Surface' objects}
      270    0.330    0.001    0.330    0.001 {built-in method pygame.display.update}
        1    0.238    0.238    0.238    0.238 {built-in method pygame.base.quit}
        1    0.224    0.224    0.224    0.224 {built-in method pygame.base.init}
      270    0.175    0.001    0.175    0.001 {method 'fill' of 'pygame.Surface' objects}
        1    0.107    0.107    4.785    4.785 eggs.py:28(Game_Loop)
     1275    0.052    0.000    0.052    0.000 {built-in method nt.stat}
    46/44    0.034    0.001    0.038    0.001 {built-in method _imp.create_dynamic}
      176    0.022    0.000    0.022    0.000 {built-in method marshal.loads}
        1    0.017    0.017    0.254    0.254 {built-in method pygame.display.set_mode}
      271    0.016    0.000    0.016    0.000 {built-in method pygame.event.get}
  590/584    0.011    0.000    0.049    0.000 {built-in method builtins.__build_class__}
      472    0.011    0.000    0.011    0.000 {built-in method winreg.OpenKey}
      190    0.010    0.000    0.010    0.000 {built-in method nt.listdir}
   487/92    0.010    0.000    0.029    0.000 sre_parse.py:469(_parse)
      176    0.009    0.000    0.015    0.000 <frozen importlib._bootstrap_external>:830(get_data)
     2188    0.007    0.000    0.018    0.000 version.py:131(_legacy_cmpkey)
   924/88    0.007    0.000    0.032    0.000 sre_compile.py:64(_compile)
      176    0.006    0.000    0.006    0.000 {method 'read' of '_io.FileIO' objects}
      335    0.006    0.000    0.008    0.000 sre_compile.py:250(_optimize_charset)
      540    0.006    0.000    2.411    0.004 eggs.py:42(Display_Objects)
    13441    0.006    0.000    0.006    0.000 sre_parse.py:232(__next)
    191/1    0.006    0.000    5.433    5.433 {built-in method builtins.exec}
     3676    0.005    0.000    0.015    0.000 enum.py:797(__and__)
      494    0.005    0.000    0.056    0.000 <frozen importlib._bootstrap_external>:1233(find_spec)
     7230    0.005    0.000    0.010    0.000 version.py:114(_parse_version_parts)
     7844    0.005    0.000    0.005    0.000 enum.py:515(__new__)
     2506    0.005    0.000    0.013    0.000 version.py:198(__init__)
        2    0.004    0.002    0.004    0.002 {built-in method pygame.imageext.load_extended}