Which is the best CMS for web development?

Our website h t t p s : / / w w w.s e n t i e n t l i g h t . c o m / is done in DNN which is a microsoft based open source CMS. However there are lot of performance issues. No AMP features, Google Mobile Pagespeed score is average because DNN framework is designed in such a way. Also these DNN people don’t plan on updating their CMS to be on par with the best CMS today.

So what are the best CMS alternatives?

Moderator Note: URL disabled so this is not SEO or spam.