<?php
define('START', microtime(true));
define('START_MEMORY', memory_get_peak_usage(true));

collect(range(0, 1000000))->slice(500000)->forPage(3,20);

define('END', microtime(true));
define('END_MEMORY', memory_get_peak_usage(true));

echo END - START,',',END_MEMORY - START_MEMORY;