Website optimization (Prestashop)

Specialist needed to optimize website in Prestashop. Problem: increased the upload time of the main page and other website pages . It is necessary to reduce the time of upload. There was made a request to the server provider, and he gave the following answer: Unfortunately, the site has a lot of errors while uploading the main page, it makes 300 requests for non-existent files, for example: 5.45.114.4 - - [25 / Jul / 2016: 15: 57: 41 +0300] "GET /img/m/[login to view URL] HTTP / 1.0" 404 1306 "[login to view URL]" "Mozilla / 5.0 (Macintosh; Intel Mac OS X 10_8_5) AppleWebKit / 537.36 (KHTML, like Gecko) Chrome / 49.0.2623.112 Safari / 537.36" 5.45.114.4 - - [25 / Jul / 2016: 15: 57: 41 +0300] "GET /img/m/[login to view URL] HTTP / 1.0" 404 1306 "[login to view URL]" "Mozilla / 5.0 (Macintosh; Intel Mac OS X 10_8_5) AppleWebKit / 537.36 (KHTML, like Gecko) Chrome / 49.0.2623.112 Safari / 537.36" 5.45.114.4 - - [25 / Jul / 2016: 15: 57: 41 +0300] "GET /img/m/[login to view URL] HTTP / 1.0" 404 1306 "http://fokus.ee/ru/&quot ; "Mozilla / 5.0 (Macintosh; Intel Mac OS X 10_8_5) AppleWebKit / 537.36 (KHTML, like Gecko) Chrome / 49.0.2623.112 Safari / 537.36" 5.45.114.4 - - [25 / Jul / 2016: 15: 57: 41 +0300] "GET /img/m/[login to view URL] HTTP / 1.0" 404 1306 "[login to view URL]" "Mozilla / 5.0 (Macintosh; Intel Mac OS X 10_8_5) AppleWebKit / 537.36 (KHTML, like Gecko) Chrome / 49.0.2623.112 Safari / 537.36" If the request is made only on the home page, without content, the download speed is very good: time curl [login to view URL] real 0m0.374s user 0m0.009s sys 0m0.005s These errors must be removed. Also there was advised to pay attention to the following points: 1) optimize your images (prestashop - save for web) or online optimizers 2) turn all cache on 3) your server response time is about 2,5 seconds. You can increase it by get better server. 4) Check Back office - Advanced parameters - Performance - Put JS to the end - must be YES. NB! Goods from the supplier are automatically uploaded from the IceCat database. If you have questions regarding this issue, it is necessary to agree in advance