We couldn't locate your support request(s) in our forum, so we're not familiar with your situation
We understand that you have problems with your page speed, which is not entirely related to a WordPress theme you're using, but the weight of your content.
The code written for all our themes is by the latest PHP standards, there's no question about that.
Documentation for Tetsuo theme can be found here
with all necessary information to get you started.
We don't recommend any 3rd party plugins for our theme, besides 2 mandatory premium plugins - WPBakery & Rev Slider, which are 100% compatible with our theme and come bundled inside the package.
When you install our theme, you can import demo content, as per this article and start from there
We would advise getting in touch with our support team, which stands by your service for anything you find confusing.
Until then, please reconsider this poor rating, we're sure we can help you solve the problems you encountered. Thank you.