wait until responsive resize finishes redrawing the page

This can be problematic for performance, particularly on mobile networks. If your fonts, images, scripts, ads, and metrics all have different hostnames, a DNS lookup will have to be made for each one.

However, DNS lookups must be done for each unique hostname the requested page references. After this initial request, the IP will likely be cached for a time, which speeds up subsequent requests by retrieving the IP address from the cache instead of contacting a name server again.ĭNS lookups usually only need to be done once per hostname for a page load. Your browser requests a DNS lookup, which is eventually fielded by a name server, which in turn responds with an IP address. If you've never visited this site, a DNS lookup must happen. If you navigate to, the HTML page is located on the server with IP address of 93.184.216.34. The first step of navigating to a web page is finding where the assets for that page are located. Web performance can be improved by understanding the single-threaded nature of the browser and minimizing the main thread's responsibilities, where possible and appropriate, to ensure rendering is smooth and responses to interactions are immediate.

Render time is key, with ensuring the main thread can complete all the work we throw at it and still always be available to handle user interactions. For smooth interactions, the developer's goal is to ensure performant site interactions, from smooth scrolling to being responsive to touch. Web performance is what we have to do to make the page load happen as quickly as possible.įor the most part, browsers are considered single threaded. Network latency is the time it takes to transmit bytes over-the-air to computers. To be fast to load, the developers' goals include sending requested information as fast as possible, or at least seem super fast. Latency is our main threat to overcome to ensure a fast load. Two major issues in web performance are understanding issues having to do with latency and issues having to do with the fact that for the most part, browsers are single threaded. Users want and expect web experiences with content that is fast to load and smooth to interact with. Fast sites provide better user experiences.

Wait until responsive resize finishes redrawing the page