my Joomla site is too slow. It approximately uses 8 to 10 s to load main page. I am using xampp. template protostar. PC core i7. OS windows. JOOMLA 3.15. Is it normal ??
It's hard to tell what the issue is when you are working on xampp/win because that set up is inherently slower than a *nix server that has been set up to run Joomla. As with most web software, Joomla is vastly affected by the hosting environment. Getting a good host is critical in site speed. We recently helped a client with site speed problems simply by moving them to a dedicated server optimized for Joomla. Load times went from 6-8 second to under 2 seconds and we didn't do anything but move the site.
I wouldn't worry about it until you get it on a production server. Even then, I would make sure you are on a quality host that specializes in Joomla like RochenHost.com.