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http://screencast.com/t/oLkcoVMk

Here is a screen cast.

Basically, query is slow when I include a column in the query.

Let me know if you can help me out in order to debug the situation.

This is a designed behaviour. Probably, your HTML column contains a big amount of data. MySQL server doesn't allow to make deffered fetch of text/blob fields, data is retrieved entirely when you perform "Execute Query".