Hi Radu, thanks for writing!
Looks like this is a premium theme so we can't download to look into it. We would say the usual performance tips would apply.
Disable theme features/additional plugins that are not needed.
Minify CSS/JS (you can use a few plugins to do the job here like Autoptimize or WPRocket)
Make sure images are properly sized and optimized - this is very important because we've seen a lot of WP themes not make use of proper image sizes.
Please let us know if you have any more questions.
Thanks, Tom
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