Images are a vital part of majority of sites, which if not optimized rightly, can consume important amount of bandwidth delaying the response of the webpages. Some pictures must be optimized rather than being scaled down. Some top practices are the use of web-friendly image formats like PNG, GIF or use of some tools, which can compress the pictures without compromising with their standard. Use of responsive pictures can also be extremely helpful.
Decline of DNS lookups
This plays an important role in browsing the website pages. It generally takes an important quantity of time for the DNS to resolve the host IP address. It additional delays the browser feedback time as the browser waits for this background resolve process to complete fully.
It is remarkable practice to slice the Hostname components to at least 4 Hostnames and that can drastically decrease DNS lookup time.
Reduction of HTTP requests
Browsers spend largely of time sending HTTP requests to download different components of a web page like flash, images, style scripts, etc. So a larger number of page components outcome in bigger loading time for the website page.
Optimized web font
The use of custom web fonts such as Google fonts is now very famous and more than half of the sites are using web fonts internationally now. Though these have certain benefits, they decrease the feedback time of website pages extensively as the browsers send plus HTTP requests to fetch them. Thus, it is sensible to keep the use of custom fonts to the minimum possible and to host them domestically with Base64 encoding.