I submitted a patch to lighthouse which caches columns ("SHOW FIELDS")
for has_and_belongs_to_many associations. See the patch and ticket
at:
http://rails.lighthouseapp.com/projects/8994/tickets/1738-caching-columns-for-has_and_belongs_to_many
The patch is simple and unobtrusive, and resulted in a 25% performance
increase (response time, CPU load, and database load all dropped by
about 25%) in my companies Rails app (http://teamsporttech.com) which
serves over 500 websites for sports teams.
Further details are at
http://lukeludwig.com/blog/2009/01/08/rails-patch-for-caching-show-fields-for-has_and_belongs_to_many-associations
If someone could take a look at this patch that would be great,
Luke
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