Redirect authenticated users to HTTPS version of page when they visit over HTTP. This module is a companion to Secure Pages or when entire site is over SSL.
securepages module redirects specific pages to HTTPS while this module redirects any authenticated user on any page to HTTPS if and only if they...

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Varnish is a reverse-proxy cache that allows a site with a heavy backend (such as a Drupal site) and mostly consistent content to handle very high traffic load. The “cache” part refers to Varnish storing the entire output of a page in its memory, and the “reverse proxy” part means it functions as its own server, sitting in front of Apache and passing requests back to Apache only when necessary.

Drupal often add a lot of CSS and JS files to a page request. The added weight and number of HTTP requests is bad for performance. This can be partly fixed by the CSS and JS aggregation feature in Drupal (also see Aggregate cache). But you still have a slight weight problem to those aggregated files.
One...

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Drupal 8 now includes two Symfony2 Components: ClassLoader and HttpFoundation.

ClassLoader provides support for the PSR-0 autoload standard.

HttpFoundation provides useful abstraction objects for the incoming HTTP request and for the outgoing HTTP response.

See the announcement blog post for more details.