The title of this post is misleading because the reality is – You should switch from http to https for SEO.
Google recently announced that it will be boosting websites rankings that migrate over to HTTPS to keep people safer on the web. As a ranking factor, it is so small that it probably isn’t worth doing – or is it?
Do you switch? That is a risk you must take. The rewards in your ranking could be big down the road or what you need to go from page 3 to 2, or 2 to 1. Look at just about any major website on SEO and you will notice that they have all adopted SSL. In general most SEO’s try to do what Google wants. Trying to game the system using black hat strategies means having to re-do all the work you did over and over again and where is the leverage in that?
If you do decide to switch, ensure that you have the correct 301 redirects to preserve your PageRank. While your website’s rankings may drop or remain the same, it is most likely that Google will reward those sites that switched down the road.
Information regarding HTTPS as carrying more weight for search algorithms.
Information detailing why HTTPS is slower than HTTP.