Yep, Moodle's resource hunger surprises many. You have to understand that Moodle is not just a CMS like Wordpress rather a heavily interactive, individualized LMS closer to an auctioning/betting site from inside.
That said, the Theme designer mode is the equivalent of a pulled handbrake. Now you've released it, you can keep on batting for some time, till you find a better hosting. For a serious Moodle site never go to a (cheap) shared hosting. As you've already experienced from the second complaint - about the outgoing e-mails. The bottom level we are ready, and able, to talk here is the good old medium sized VPS.
That said, the Theme designer mode is the equivalent of a pulled handbrake. Now you've released it, you can keep on batting for some time, till you find a better hosting. For a serious Moodle site never go to a (cheap) shared hosting. As you've already experienced from the second complaint - about the outgoing e-mails. The bottom level we are ready, and able, to talk here is the good old medium sized VPS.