CSS3 consumes a high amount of resources

Currently, I am in the process of developing a hybrid app using Ionic. My main focus is on customizing the Ionic main CSS via SCSS and adding my own custom CSS as well. The layout of the app has been achieved without extensive use of JavaScript logic and it is functioning on Crosswalk. While the layout looks good overall, there seems to be some lag on low-end smartphones.

I have a question regarding CSS elements that could potentially consume high resources. Does using shadows increase resource consumption? What are the best practices for developing a high-performance CSS layout?

Answer №1

As a moderator on the Ionic forum and also a blogger, I have some tips and tricks to share with you.

Regardless of the framework you choose, low-level Android smartphones can pose a challenge. However, most issues can be resolved.

The most common CSS3 features that cause performance issues include:

  • shadows (especially box and text shadows)
  • opacity
  • gradients (although less problematic than the others)

It is advisable to utilize CSS3 hardware-accelerated features to offload processing to the GPU, freeing up the CPU for other tasks.

I have written an article on this topic which you can find here.

In addition, two major challenges on low-level smartphones are view animations (transitions) and list performance.

If you have a large list, consider using collection repeat feature in Ionic. For smaller lists, classic ng-repeat with native scrolling enabled can enhance user experience.

To improve view transitions, you can use the Cordova Native Transitions plugin for nearly flawless results. Check out a demonstration with video examples here.

For reference, see below:

Classic CSS animations (poor performance):

https://www.youtube.com/embed/niHxogcq2F8

Native Transition animations:

https://www.youtube.com/embed/mJifdqoIJ_s

Answer №2

To improve performance on low end devices, I recommend removing all css files and testing again to determine if the issues are css-related. It's important to write efficient css selectors and avoid using bad css properties. You can also learn how to profile your web application using remote debugging tools like those found in Chrome and Safari/iOS. Stay updated by reading dedicated blog posts from various authors online.

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