If you think your website is running slow there there are a number of things to do to improve page speed.and loading times. If you are on wordpress there are also alot plugins to aid this, follow this guide on how to improve your websites speed.
Most companies have signatures for email, this is simple to do in outlook, now in exchange 2010 we can create a signature for OWA. Here is a guide on how to add a signature with an image to OWA.Add an image to your signature in exchange 2010 and exchange 2007
Algorithm updates are not new, Google has been tweaking their search algorithm for many years in an effort to bring the quality content to the fore and to counter-act any build up of spammy or useless content.