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JRuby Basics
JRuby is a polished and stable Ruby implementation. Here I show the basics of setting it up and executing Java from within Ruby. I also see how it compares with MRI at running threads.
(10 minutes)
Bullet
Bullet will notify you of database queries that can potentially be improved through eager loading or counter cache column. A variety of notification alerts are supported.
(6 minutes)
Counter Cache Column
If you need to display the record count for a has_many association, you can improve performance by caching that number in a column.
(7 minutes)