We have created header for you using the header builder. Check, please. Search by SKU works with a full SKU number http://prntscr.com/qf4lg9 and partial.
To speed up the search and your site:
1) Disable all the plugins that you don’t use. Every additional plugin slows down the site.
2) Use cache plugin (we installed W# total cache but you can choose any other you like)
3) Reduce the server response time
4) Make sure that DB structure is optimized.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.