Optimisation

Writing code which runs fast.

Consider having configurations which are read from DB frequently but written-to rarely, be set in configuration files which are written-out from the DB (like the CSS from themes)

• ​http://wiki.python.org/moin/PythonSpeed/PerformanceTips
• ​http://www.python.org/doc/essays/list2str/
• ​http://www.skymind.com/~ocrow/python_string/
• ​http://diveintopython.org/performance_tuning/index.html
• If a specific inner-loop routine canot be optimised in Python, then consider writing a C routine for this use case.

for i in range(0, len(rows)):
     row=rows[i]

runs much faster than:

 for row in rows:

(0.05 vs. 0.001 seconds in my test case).

Profiling

• ​http://www.cherrypy.org/wiki/Testing#Profiling
• ​http://mg.pov.lt/profilehooks/
• YSlow plugin for Firebug: ​http://developer.yahoo.com/yslow/

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DeveloperGuidelines