Performance

Good morning,
I’ve been testing Zerif lite on my computer running Xampp.
I’ve also been testing the live demos of both Zerif Lite and pro from their website…
https://demo.themeisle.com/zerif-lite/
https://demo.themeisle.com/zerif-pro/

I’m not sure why, but I have the feeling that the PRO demo runs smoother than the lite version. Also take in consideration that the lite version has less features (therefore less elements, lighter) and zerif PRO has a video running on the background and has more elements on it’s front page…

Is there an actual difference about the performance between the two zerif versions?
is there any way to improve performance in Zerif lite?

Thank you