DNS response time Slow website

We created a new droplet in Digital Ocean to improve some limitations and performance issues that we had with the previous droplet. While we were configuring the droplet and the project, we used a subdomain. This worked very well and the performance improved greatly. The subdomain was running fast in the new droplet. Then we decided to change to the domain we use in production (www.ibericoclub.com) and all of a sudden the site started to run much slower. The images are slow to load, and the site in general is loading very slowly. What do you think is happening? Why was the subdomain in the same droplet running fast until we changed it to the production domain (www.ibericoclub.com)? Any suggestion is welcome. We need to fix it ASAP. Thank you.

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