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IMAGES Factors

Avoid Broken Images

Some image source files have the broken image links,and these links are found when the URL is wrong . A Broken image created a wasted response from an HTTP request, which increases the page load time.Now, the browser tries to download that image which is not available meaning our web page spends more time trying to download the image ultimately slowing down the website.Also the user-experience will take a hit with those broken images. Broken images are one of biggest drains on the page load time. WIth Web Analyzer one can check for broken image links and manually removing them from the websites. Handling broken images on the image server is best way as it will handle for all type of image formats

Image Optimized

Images optimization is a major issue that threatens the webpage latency rate and full page loading.Nowadays, images are becoming more and more render blocking sources that is a major issue in any webpage.Web Analyzer has factors listed out the parameters required to optimize the images.

Thumbnails and Images Count

Too many images generally kills the webpage with each image taking extra requests to process by the browser. While browser handles the image syncronously well, a web page with too many unoptimised image will not be stable and user experience will be of low grade.An image must avoid pixel dimensions greater than the biggest resolution at which it will be displayed, as anything more than this is wasteful. It is not the count of the images that is critical but how long each image when all combined takes to load.A page that has fewer images and response time is fast might reach the audience better compared to a slow-loading page full of the attractive images.

Image Resizing at Browser End

Image Resizing by the browser means that the browser behind the scenes in general loaded the same image and then it reprocessed it to display a defined size image to the viewer. It means browser takes extra time to resize image and think of hundreds of images in the website will take time and affects the response time for the page load. The general attributes used for image resizing are 'width' and 'height', we will not say these are the cluprits but if the user's graphics performance is low (say, on a Netbook or an older machine) using these attributes will hamper the speed and can slow down the whole site. So Web Analyzer recommends not to do image resizing using html

Total Image Size

A webpage with well-optimized images images will respond quicker than a page with one large image file.So the overall size of the images matters in loading a web-page quicker. As a general rule, our largest images must not exceed 2000 pixels JPEG images are compressed and are genrally the smallest in size PNG allows the transparency in images whereas the JPEGs do not. The images which are saved in a loosy format will look different than their original image when uncompressed. Genrally the lossy compression is good for the web, because images take small amount of memory All the white space around the images must be removed. Formats of the images files must be proper Saving the image in their proper dimensions Web Analyzer recommends no more than 6 mb images in a web page for better speed performance.

Use Image Sprites

CSS Sprites is a way of combining several images into a one image file images into a one image file. The process of sprites is fetching the images ,shifting it around and only display parts of it. This will reduce the time to fetch mutliple images. Although the total image size goes up with the sprites,many of the images are loaded with a single HTTP request. Browsers will limit the number of parallel requests a site can make and HTTP requests require a bit of handshaking.

Etag Headers

Enitity tags are a way to determine weather component in the browsers's cache is matched against that of the backend server. That component can be either an image,css,scripts,stylesheets etc. Sending Etags everytime in the header takes a lot-of time for the requests to process and corresponding status is sent back to server.

Favicon Images

A favicon is an image small icon file which is related with the website. When a browser requests your website it does a silent lookup behind the hood for the favicon.ico.One can see that in Waterfall in Web-Analyzer.To speed up the rendring process of favicon images, images should be small and cacheble

Http2 Enabled

The essential objectives for HTTP/2 are to decrease inertness by empowering full solicitation and reaction multiplexing, limit convention overhead through effective pressure of HTTP header fields, and include support for solicitation prioritization and server push.The implementation of HTTP/2 prioritisation allows clients to provide preference over particular data streams. The primary goals for HTTP/2 are to reduce latency by enabling full request and response multiplexing, minimize protocol overhead via efficient compression of HTTP header fields, and add support for request prioritization and server push Main goal for HTTP/2 is to enable the full request/response multiplexing, minimize protocol overhead via optimized compression of HTTP header fields. HTTP/2 is binary, instead of textual. It uses header compression HPACK to reduce overhead. It reduces additional round trip times (RTT), making your website load faster without any optimization. It allows servers to “push” responses proactively into client caches instead of waiting for a new request for each resource.

Image DPI

DPI represents Dots Per Inch. Its is a measure of spatial scanner dot density. Generally, it is termed as the number of unique dots which are placed in a row within 1 inch of span. There is a standard that web images should not increase the 72 dpi.Anything over 72dpi will create larger files, which means slow downloads.