Hi, I was doing speed tests, since my page sometimes goes a little slow, and I saw that the theme itself already has these performance problems on phones, since on PC it gives it a good rating. You should make improvements to achieve better performance on phones, since a large part of the users will access the website through a phone, therefore, it should have excellent performance as when accessing from a PC.

https://pagespeed.web.dev/analysis/https-epsilon-mb-themes-com/cve7bdu9my?form_factor=mobile

Thanks.

Interesting questions. I'm also currently comparing themes and sorting out the advantages und disadvantages. Was about to buy it but didn't know about the speed problem of the Epsilon theme 

All theme demos are just pure demos with no optimization, so you see what you get.
Performance of all themes is similar.

Osclass themes are provided as base templates that users need to customize and optimize themselves. So don’t worry—you can make your theme as unique as your favorite coffee… with extra foam and maybe a cookie on the side! 😄

Osclass themes may require quite a bit of customization, but in the end, they are highly functional and SEO-friendly. With a solid foundation, Osclass provides excellent tools to create a powerful, well-optimized website. It's a great choice for anyone looking to build a classified ads site with ease and efficiency!