Here we are, part 4b. By using XDebug, a pecl extension, our php code can be analyzed pinpointing the slower functions. Installing XDebug is easy: pecl install xdebug Now, you’ll have to enable it in the php.ini file: extension=xdebug.so xdebug.profiler_enable=1 xdebug.profiler_output_name=profiler-%s-%t.cache xdebug.profiler_output_dir=/tmp/xdebug Don’t forget to create the directory and give apache enough permissions to write in it. So after restarting [...]