[web2py] performance issue select().first()

[KMax]

Hello
 I have situation when .select() give lots of rows select().first()
start consume lots of cpu.
 I work around this by changing  query to minimize answer of select().
 LOGGING = True gives this in profile.log
   ncalls  tottime  percall  cumtime  percall
filename:lineno(function)
        3    2.110    0.703    5.397    1.799 sql.py:3146(parse)


 I guess something could be done to avoid workaround by sql-query,
sorry if i am lame :)
Thank you.