Verify the PHP limits
In order to do that, you must go in the WordPress Dashboard > Superhero and then check the System Status. There you will see the WordPress Environment with a column that refers to the installation value and then another column that refers to the limits of your host.
In order to find out more details, you can contact your host and ask what are your current settings. If needed, you can have them adjusted. The reason why certain host will keep the PHP limits low is because they wish to converse resources. However, you are paying for those exact resources, so it is your right to benefit from them.