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I have a WordPress website that I started building for free and eventually paid the $50 bucks for the premium version.  My goal right now is to increase the speed.  The current speed rating for the site on Google Insights is 60/100 for mobile and 66/100 for desktop.  I have used some plugins to help me increase the speed, but the previous number were the best I could do.  How can I get this site at least into the 90/100 range?  Should I buy another template, or can I hire someone to go through and optimize it.  I would like the best option that is as cost effective as possible as this is a hobby site for me.  Thanks!

I have a site that is hosted on a very old platform and would like to move it to WordPress.  We are a surf shop and the summer months are the busiest for us.  I want like to make sure that if I transfer my site that it won't hurt our rankings in any way.  What would the best way of doing this be? i.e start building the WordPress site and once it is finished, point the domain to it? Will this have any ramifications for our rank?  Thank you!