web-performance | 易学教程

Under what circumstances would loading images individually with HTTP/2 be slower than loading all images at once with a sprite a la HTTP/1.1?

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问题 HTTP/2 makes it possible to multiplex connections, eliminating the need for more than one connection to a server. Over a single connection, many individual images can be sent down to the client. This obviates the old image sprite pattern of combining many images into one and using CSS to cut it apart. I'm curious if sprites would still actually be faster in an HTTP/2 world. If so, under what circumstances? 回答1: Sprites, as you will know, are used to prevent multiple requests being queued, so

Can we populate the QueryString Parameters and values from Parameter sets?

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问题 How should i configure my URL based load test in VSTS such that i can repeat the load test with different parameter values. Can I load the parameters and values from Parameter sets ? If yes, How to do that? 回答1: You can load the parameters and values from the Query String Parameters. It will add the string ?para=value in the URL you configured. But it cannot repeat the load test with different parameter values. The feature you want to achieve is Data-Driven test, you can refer to this article

Tools to make CSS sprites? [closed]

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Are there any good tools to make css sprites? IDEALLY I'd want to give it a directory of images and an existing .css file that refers to those images and have it create a big image optimized with all the little images AND change my .css file to refer to those images. At the least I'd want it to take a directory of images and generate a big sprite and the .css necessary to use each as a background. Are there any good photoshop plugins or fully blown apps to do this? This will do 90% of the work for you: http://spritegen.website-performance.org/ . You'll still need to edit the rules yourself,

Tools to make CSS sprites? [closed]

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问题 Are there any good tools to make css sprites? IDEALLY I\'d want to give it a directory of images and an existing .css file that refers to those images and have it create a big image optimized with all the little images AND change my .css file to refer to those images. At the least I\'d want it to take a directory of images and generate a big sprite and the .css necessary to use each as a background. Are there any good photoshop plugins or fully blown apps to do this? 回答1: This will do 90% of

Max parallel http connections in a browser?

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问题 I am creating some suspended connections to an HTTP server (comet, reverse ajax, etc). It works ok, but I see the browser only allows two suspended connections to a given domain simultaneously. So if a user is looking at my website in Tab1 of their browser, then also tries loading it in Tab2, they\'ve used up the two allowed connections to my site. I think I can do some wildcard domain thing, where I have my http server resolve any address to my site like: *.example.com/webapp -> 192.0.2.1