WordPress MY SQL Load increases

Dear Team,

We have a dedicated server on which wordpress is installed and we have quite good configuration. The wordpress works fine with the old theme we work with. We decided to revamp the website UI and got a new theme which is Smart Mag. We had installed wordpress on the same server inside a new folder named newsite. There the entire website works fine. But when the same is moved to the root server the mysql load shoots up and brings down the server.

Could you let us know what might be the issue.