[pygame] Weird lag

[Daniel Mateos <daniel@xxxxxxxxx>]

Hey again,

In a 2d scroller game im making i seem to get FPS drops at random
points, i am using the Clock class to keep it at a constant 60 fps and
it never seems to go above 9%-15% cpu usage so im not sure what could be
causing it.

Seems to run well for 90% of the time with spikes that drop the fps to
10-40 at some points in the level, other times it runs fine at exactly
the same points and its not doing anything extra doing these spikes, im
bliting about 100-200 sprites per frame.

Some quick profiler output, doesnt really tell me much tho:

 ncalls  tottime  percall  cumtime  percall filename:lineno(function)
     1233   10.177    0.008   10.177    0.008 {built-in method tick}
     1233    4.982    0.004    4.982    0.004 {pygame.display.flip}
   153699    3.211    0.000    3.211    0.000 {method 'blit' of
'pygame.Surface' objects}
   542520    0.424    0.000    0.424    0.000
game_level.py:129(CheckOnScreen)
     1233    0.419    0.000    3.889    0.003 game_level.py:56(RenderLevel)
   487287    0.312    0.000    0.419    0.000
game_level.py:105(CheckCollide)
     1233    0.291    0.000    0.757    0.001
game_level.py:122(CheckCollides)
     3615    0.160    0.000    0.160    0.000 {method 'render' of
'pygame.font.Font' objects}
        1    0.150    0.150    0.150    0.150 {pygame.base.init}
        1    0.126    0.126   20.979   20.979 main.py:18(<module>)
   487287    0.107    0.000    0.107    0.000 {method 'colliderect' of
'pygame.Rect' objects}
        1    0.093    0.093    0.121    0.121 {pygame.display.set_mode}
493258/493031    0.048    0.000    0.048    0.000 {len}
        4    0.048    0.012    0.048    0.012
{pygame.imageext.load_extended}
     1233    0.042    0.000    0.042    0.000 {pygame.event.poll}
     1233    0.040    0.000    0.096    0.000 game_osd.py:79(DrawBar)
        4    0.034    0.008    0.034    0.008 {method 'convert' of
'pygame.Surface' objects}
     1233    0.033    0.000    0.805    0.001 game_level.py:44(update)
        1    0.017    0.017    0.125    0.125 __init__.py:25(<module>)
     1233    0.016    0.000    0.041    0.000 game_osd.py:106(WriteText)

Any help or suggestions for better profileing/tracking down the lag
would be good :)

-- 
Daniel Mateos
http://daniel.mateos.cc