Jokes apart, this is the famous solution: Change your hardware and change your software.

Many technicians analyzing your site end up with the above two things. To some extent, this reasons bring results. A Hardware problem means you need a relatively muscular server depending on the number of visitors you serve at a time. It will cost you an expensive migration benefiting you in the long run.

A software problem is caused when an irritating extension loads unnecessary data and in this case, your developer needs to go deep in the code.