The Superhero theme is properly tested before being released, in order to ensure that it operates smoothly.
However, if you choose a host that has limited capabilities or capacity, then you should expect to encounter certain problems.
Because of this we recommend using a WordPress trusted host, and benefit from quality products and reliable service. Keep in mind that these recommandations are based on the quality of the services and products that these hosts offer.
We also offer hosting packages, check our site here.
Also, we offer you a list of not recommended hosts: GoDaddy, Hostgator & 1&1. We recommend that you go online and search articles about them in order to understand more about their poor performance with WordPress.