Firefox just had a recent update to Mozilla 13. It loads tabs faster, loads tab in demand first for a tab recently viewed supports more than 85 languages and an automatic upgrade every time a new browser is being opened.
Speed is probably the best thing that was being added to the browser as it supports SPDY by default reducing load times for websites supported by SPDY.
What is SPDY?
How does it become speedier than HTML?
Speedier Mozilla 13 recently released
I think your question is a mistake. You cannot compare SPDY to HTML because, a SPDY is considered as a replacement for HTTP as an Internet Protocol for web traffic. As of today SPDY is considered as an alternative experimental protocol for faster web browsing. It is an application-layer protocol for transporting content over the web, designed specifically for minimal latency. While HTML is considered as a language for displaying web pages and other information that can be displayed in a web browser, it is also serves as a cover on how web pages are formatted or formulated and displayed.
Though there is a recent discussion on Google Analysis, that talks about the speed and performance between SPDY and HTTP on mobile networks. The net result is that using SPDY gives in a mean page load time improvement of 23% across 77 pages across 31 popular domains, compared to HTTP. This is equivalent to a speedup of 1.3xs for SPDY over HTTP. SPDY uses a single SSL connection per domain, whereas HTTP opens multiple parallel connections for fetching resources from the server.
Comparison of SPDY vs. HTTP page load times
Page load time reduction for SPDY for each of the measured sites
This is their flow chart. You can see their full discussion on this link page. https://developers.google.com/speed/articles/spdy-for-mobile
hope my explanation helps you.. 🙂
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