![speed contact bar html5 css speed contact bar html5 css](https://beardesign.me/media/5bbbeb89c62061.15694224.png)
Once SKP files have been generated for each HTML file, we run another batch to push the *.SKP files through the Skia Benchmark application (built from the Skia source code) which dumps out the average time taken to render that page. With this setup, we generate a suite of HTML pages, where each page contains a unique permutation of CSS properties and values for instance, here’s two html files: īackground : url (foo.png ) top left / 50% 60% īackground : radial-gradient (circle closest-corner, white, black ) īelow, as a variant of the last example, where we only change the radial-gradient value: īackground : radial-gradient (farthest-side, white, black ) Įach page is then loaded into a fresh instance of Chrome (to ensure that timings weren’t somehow biased by any stale states in page reloads), and a Skia Picture (*.SKP) is taken to evaluate what Skia commands are used to paint the page. In order to help debugging the rendering of a page, SKIA allows you save out Skia Picture (*.SKP) files which record all the commands used to paint the page.
Speed contact bar html5 css software#
(This part is important…)Ĭhrome’s software rasterizer package is called SKIA, and it not only handles rasterization of your web page, but also all your HTML5 Canvas API needs (Boxes, lines, bitmap fills, drop shadows, blurs, all the calls Chrome needs to turn your DOM into pixels). Dump out all the timings, and marvel at the numbers.Run each Skia Picture taken through Skia Benchmark to obtain timings.Run some automation script that, for each page, will:.Generate a suite of individual HTML pages each one with a single DOM element and some permutation of CSS properties attached to it.To do this, I wrote some automation with duct-tape and bubble gum to attempt to add numerical visibility to CSS paint times, which worked like this:
![speed contact bar html5 css speed contact bar html5 css](https://i.ebayimg.com/images/g/mvYAAOSwq~NfyKpu/s-l64.jpg)
My goal was to categorize a large set of CSS properties/values by their paint times, so that we can create an understanding of what types of CSS properties are more performant than others. So the question became: How do different CSS properties affect the render-weight of your page? For example, rasterizing a small image to the screen is a completely different algorithmic operation that drawing a drop shadow on an arbitrary shape. Having spent a great deal of time writing software rasterizers for 3D purposes, it became apparent in my mind that some CSS properties should have varied performance when drawing your page. Chrome will move the tiles in and out of memory based upon need and performance heuristics that can change between platforms. These tiles are then passed off to the GPU, where the hardware will do the final drawing of tiles to the screen, a process known as Compositing. The quick version of these articles is that the hardware accelerated path in Chrome will Paint your page by rasterizing the page visuals into tiles.