Problem with flyingpress

Hi,

I have a problem with your plugin and flyingpress, i can’t preload the URLS, because each time i have this error : Maximum execution time of 300 seconds exceeded in /vhosts/www.gladiatorfit.ch/html/wp-content/plugins/permalink-manager-pro/includes/core/permalink-manager-core-functions.php on line 228

I had commented it and it’s working perfectly now, but i think that’s not good to leave this like that

How can i repare that ?

Many thanks for your help