First, check to see if your internet connection is slow. This can be checked using https://www.speedtest.net/
Second, did you recently add a large image to the page you are trying to view? If so, make the image smaller.
Third, did you add a new plugin? If so, that might be what is slowing it down.
If you still are having trouble identifying why your website is slow, then please reach out to us and we can troubleshoot the issue for you.