Performance Measures — Part 2 MCQs with Explanations

The Video tab allows you to capture screen shots of your page as it loads and views them as a video.

In the Advanced panel, you can have the test stop running at document completion. That will tell us when the document.onload event is fired, instead of when all assets on the page are loaded.

XHR communications that may happen after page load could register as new activity and skew the test results.

This method adds a new point P to the subpath and connects it to the current point with a cubic Bezier curve.

The arc() method adds an arc to the current subpath.

To ensure that our first-time visits are as streamlined as possible, we need to minify our JavaScript.

Minification is originally based on the idea that the JavaScript interpreter ignores white space, line breaks, and of course comments, so we can save on total file size of our .js files if we remove those unneeded characters.

Minify proxies the JavaScript file;the script tag on the page points to Minify, which is a PHP file.

Minify reads the JavaScript file in, minifies it and when it responds it sets the accept encoding HTTP header to gzip, deflate.

Effectively Minify has built in HTTP static compression. This is especially useful if your web host doesn’t allow the gzipping of static content.

To navigate to the Minify control panel, it is located in the /min/builder/.

Minify reads in the content, decorates it by way of removing extraneous characters, and gzips the response.

Just like Minify, YUI Compressor strips out all of the unnecessary characters from your JavaScript, including spaces, line breaks, and comments.

YUI Compressor is a jar file and runs from the command line. Because of this it is easily integrated into a build process. It looks like this: java -jar yuicompressor-[version].jar [options] [file name]

Closure Compiler runs through a number of “scorched-earth” optimizations—it unfurls functions, rewrites variable names, and removes functions that are never called (as far as it can tell).

Closure Compiler runs through a number of “scorched-earth” optimizations—it unfurls functions, rewrites variable names, and removes functions that are never called (as far as it can tell).

The Closure Compiler was introduced by Google.

The script tag sends the HTTP Request to the Minify.

The JS File returns the Minify JavaScript.

Sheer file size reduction is the only one aspect of the overall determination got from the R along with the minification.

The Closure Compiler (advanced) has a more number percent of file size reduction by product.

JavaScript optimizers such as JSMin and Packer are specially designed for modern web programming techniques, and are able to understand and preserve conditional comments, and similar.

Content encoding is an approach taken by compatible web servers and modern web browsers to compress HTML and related textual content, often in the gzip format.

In Perl culture, aiming at extremely minified source code is the purpose of the Perl golf game.

Gzip encoded is the correct answer to “What does the Minify return back to the Script tag”. This question is standard in competitive examination syllabi for Performance Measures.