Optimize the speed of loading the site on OpenCart

Good afternoon! There is a website https://annagale.ru/ made on CMS Open Cart. With the increase in the number of products, problems with the loading speed of the site appeared. You need a person who has extensive experience with this CMS and will be able to name the price for the analysis of the site (as a result of which he will write down point by point what will be done to speed up the loading and the cost for each action) and after agreeing on the cost will help with the announced optimization.

When responding, please immediately name the cost and timing of the site analysis