>> You're assuming that. It could be the queries being run are the costliest.
It has got nothing to do with the cost of query. bare mysql_connect()
is very costly.
compare
<?php
$time = microtime(true);
mysql_connect('localhost', 'user', 'pass');
//mysql_close();
echo (microtime(true) - $time) . "<br>\n";
$time = microtime(true);
mysql_connect('localhost', 'user', 'pass');
mysql_close();
echo (microtime(true) - $time);
with
<?php
$time = microtime(true);
mysql_connect('localhost', 'user', 'pass');
mysql_close();
echo (microtime(true) - $time) . "<br>\n";
$time = microtime(true);
mysql_connect('localhost', 'user', 'pass');
mysql_close();
echo (microtime(true) - $time);
to see the difference.
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