That has not been my experience. I've been a Namecheap customer since 2005 (though now only for TLDs that aren't supported by my preferred registrars), and each time I visit their website it seems slower than the last. The interface is better than GoDaddy or 1and1 were the last time I used them, but that's a very low bar. I wouldn't call it good.
At one point they overhauled the frontend to add some loading animation to make it feel faster, but the backend has only gotten worse. Saving any changes is way slower than any other service I use with regularity.
I was going to take some measurements to back up this post, but...
> Namecheap is under maintenance and will be back soon
> Our site namecheap.com is currently undergoing an emergency maintenance to upgrade our systems in order to better serve you.
I won't be using this new service.