This article is concerned about client side issues of web resources load process related to user agents (browsers) behavior. a lot of modern problems such as improving global availability and reducing bandwidth, the main problem they address is latency: the amount of time it takes for the host server to receive, process, and deliver on a request for a page resource (images, css files, etc.). latency depends largely on how far away the user is from the server, and it's compounded by the number of resources a web page contains; current load algorithms are investigated and all known solutions with their area or efficiency are explained. We have described four main optimization methods.