Probably your problems are associated with the website’s content. Especially website images are really big problems. They cause the website to have low performance. You can use analytics tools. For example, Google Page Insights. It is a perfect analyze tool for websites. You should check the report that Google present to you. You see your website problem like this:

You should examine opportunities. Generally, essential problems are related to images like be in there. You should solve these problems. For this, there are several tools. For example: Cloudinary, image4io. Image4io is cheaper than Cloudinary. At the same time, its performance is similar to Cloudinary. image4io optimize your images, deliver with CDN, manager your storage. Your website speeds up maybe 4–5 seconds. It is a perfect saving.