it hangs if the table amount is more…

Hi,
I used your plugin without problems in three of my four websites and it worked fine but the last one had more than 50 tables and the plugin hanged.
This is the output from log file of my hosting panel

Tue, 21 Feb 2017 13:52:48 GMT [error] [client 151.82.16.250] – https://www.wocmultimedia.biz – Script timed out before returning headers: php-cgi, referer https://www.wocmultimedia.biz/wp-admin/tools.php?page=search-replace

I tried to reinstall the plugin but nothing. I had to change plugin and succeeded in my task.
I wish this my warning can help you improve the plugin