I've decided I need to use SSL for at least a few pages of my site (the login page, for example). Just wondering if there would be any downside of just using it for the entire site instead of trying to make it switch back and forth between the two all the time. For example, do encrypted pages take a noticeably longer time to load? Are they supported by most phone browsers?
Your site would appear slow, since nothing will be cached, so all images, scripts, and stylesheets will have to be loaded afresh for every new page. The slowdown could well be significant enough for it to have visitors giving up on your site and leaving. You will notice that the majority of secure sites have a simpler design than their non-secure counterparts.
Performance would be the primary disadvantage, though you might not notice any difference at all with light traffic.
It would be slower to load which is the main drawback, I cant really think of any others but i would just stick to SSL on the parts that need it