Every option row marked autoload = yes is fetched on every single request, as one query that loads the lot into memory. add_option() takes an argument to opt…
By default mysqldump locks every table it is reading, which on a busy database means writes queue behind the backup for as long as it runs. –single-transaction instead…
WordPress stores callbacks in an array keyed by hook name and then by priority. remove_action() looks in exactly one of those priority buckets — the one you name,…
A table redrawn over ajax loses every handler bound directly to its rows. .live() answers that by binding once at the document and testing the selector against everything…
A floated element carrying a margin on the same side as the float has that margin doubled in IE6. Twenty pixels of margin-left on a left-floated column renders…
A second WP_Query in a template is harmless right up to the point where you call the_post() on it. That method assigns the global $post and runs setup_postdata(),…
CodeIgniter’s Active Record resets itself after every get(), which is what you want almost always and a nuisance exactly once per paginated listing: the total and the page…