Karel Bemelmans' BLOG
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Performance debugging basics: the MySQL slow log
In this blog post I'll show you how simple and usefull the MySQL slow query log can be to find performance problems in a Drupal 7 site running a complex import task as a drush batch process.
One hour of New Relic to solve a critical performance issue
This post shows an example how easy it was to find a performance problem on a production website using New Relic's APM.