I'm not denying that Class::DBI will be slower than using straight DBI but in most cases this doesn't matter.
Hm... "most cases". What kind of "most cases" are you thinking of? Have you used Class::DBI on a heavily loaded web site, for example?
And where it does matter, you can step outside of C::D and just use DBI and SQL.
Do you have any suggestions on how you would find out when it matters? Any hints on profiling a Class::DBI app?

In reply to Re^2: Best way to do caching of Class::DBI objects from a MySQL database by doom
in thread Best way to do caching of Class::DBI objects from a MySQL database by eXile

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