Hello 2net and thanks for your review. You have been reaching out the support during the weekend so that's why the response wasn't so fast and the developers were not available.
Actually, the theme can achieve an A in the page speed score if the website is correctly set. On themeforest we are forced to follow certain development rules and those rules are against performance, because performance is something that needs to be achieved via another workflow for the optimization.
To optimize your website, there are several ways depending on your page contents, plugins and server setup, we can help you out on this with pleasure.
About plugins translation, all the plugins should be easily translatable using the standard .po and .mo method and they are currently tested and working.
If you encountered any untranslatable string, please get in touch with us and I'll personally make sure that everything is correctly fixed and working.
I'd please like to invite you to reach me out at email@example.com for a dedicated support channel. Please be sure to use the email subject EMAIL SUPPORT, and include this URL in the email body in order to track the ticket: