It seems you are not using CDN and scaling images most of the speed bump you will see once you solve these issue.
I have attached a gtmetrix report, you can skim through to solve issue noted here, you have no handle on external request but cache internal ones, use correct image sizes, compress those images through tinypng.com, use cloudflare if you don't have any other cdn otherwise i'll recommend cloudfront, enable compression from hosting, and other as required.
Fully Loaded time: 30.6s, Total Page Size: 3.86MB, Requests: 194
gtmetrix.com
On the other hand if you can't do that then shoot me a PM and i can do it for you.