Web performance stands for the speed with which pages are downloaded and displayed on the user's browser. A perfect website performance can ensure more customer retention and better user experience, than a slow loading page.
Internet speed: When speed reduces, the page will take more time to load, display the html documents, files and images, thereby affecting the performance.The performance of a website can also be affected by ISP latency issues as it will result in increased latency for the website.
DNS resolution time: DNS resolution time can affect the latency of a website. So when the time to resolve the Domain increase, the website response time also increases thereby impacting the user experience.
Page size: When the page size is high, the time taken for a webpage to download will increase and it may slow down the website.
CDNs: When CDNs are not used, it may result in high latency thereby affecting the end user experience.
Thirdparty domains (if used):Third party domains which are not optimized can result in high latency thus affecting page response time and user experience.
Number of images/JS/Videos in the page: Having heavy images, images without caching information, images with complex file formats, text graphics or videos can increase the page load time.
Back end server performance: When there is a sudden hike in the traffic, the web server might receive more requests than it can handle, which can result in a poor performing website.
Website performance monitoring is the best way to ensure that the performance of the website is not being interrupted and can be defined as a method to gauge the ability of a website to respond seamlessly to user interactions. It helps to identify the issues with the website or application proactively and resolve them before it impacts the end users. It can be performed from multiple locations around the world to identify any regional issues affecting the performance. It helps to resolve issues sooner by providing troubleshooting information like trace route to find RCA for the network problems.
Performance monitoring can help in getting more visibility into website response time split up like DNS time, connection time, first byte time, download time, SSL Handshake time and more. Moreover, it will analyze how the website responds when accessed from various global locations and take swift corrective actions in case of downtime.