Thank you for your review.
We're sorry for the bad experience you had.
We located all your support requests in our forum and established that you actually received response for all of them.
When it comes to demo import, this is the only way we developed so far. We didn't include a possibility to import one page at the time, which is also noted in our official import guide - https://edge.ticksy.com/article/12617/
When it comes to website speed, this is rather website-related problem, it hardly has anything to do with the theme, since the scripts that are loading are minified and the PHP code is written by the latest WordPress standards, so the problem must be with your media files (usually too large) or PHP version on your server.
We suggest this helpful article that explains everything about page loading time and how to decrease it - https://wpklik.com/wordpress-tips/how-to-make-your-wordpress-site-load-faster/
All the best.