wp-includes/option.php 

function get_option( $option, $default = false ) {

$time_start = microtime(true);

$tmp=dirname(__FILE__)."/../../tmp/option.wp_load_alloptions.tmp";

//echo $tmp,"<BR>";

if (!is_file($tmp)||filemtime($tmp)<time()-30*60) {

$alloptions = wp_load_alloptions();

file_put_contents($tmp,serialize($alloptions));

//echo "..reload..";

}

else {

$alloptions=unserialize(file_get_contents($tmp));

//echo "..cached..";

}

if (defined("DEBUG1")) {

$time_end = microtime(true);

$time = $time_end - $time_start;

echo "Did nothing in $time seconds <BR>";

var_dump($alloptions);

exit;

} 

결과 평균 0.2 ->  0.02 초로 개선됨..