Please try to increase the maximum execution time for this script. This can be done either for all scripts at once by editing your php.ini file and changing this line:
max_execution_time = 3000;
Or by placing the following line as a first line to ./includes/image_functions.php file of ViArt Shop distribution:
set_time_limit (6000);
Remember to do backups before doing any changes and that files from "includes" folder should be uploaded in Binary mode. You can also contact us at
https://www.viart.com/support.php if you need anymore help.
Regards,
ViArt Team