What DE does 16.3 core use

I have 16.3 lite on my 2008 desktop and it runs quite well. But I got hold of a copy of 16.3 core and tried it on a live USB and it seems just as fast as lite. What DE does core use is it Gnome?

Yes, Zorin OS Core uses Gnome D.E.

It is optimized to be very quick on its feet even as a heavy desktop environment. However, some users on some specced or older hardware still can run into issues with Core since even optimized, the resource usage can always run high.

Zorin OS Core can run quite well on a large variety of affordable or older hardware but not all.