Google has issued an ultimatum; websites that fail to display without flaw on ALL devices (including smartphones) will NOT achieve high rankings on search engines. The “OLD” HTML design that most websites have utilized over the past 10 years has effectively become obsolete in terms of search engine ranking. We highly recommend to start re-designing your site to be FAST loading and responsive – the type of HTML that makes web pages viewing-compatible across ALL of the various platforms. This includes desktops, laptops, tablets, iPads, iPhones, and Android devices.
Having unplayable videos (especially Flash), faulty re-directs, irrelevant cross-linking, and slow loading pages will all greatly affect your website’s performance.
This means that many sites have a LOT of room for improvement!