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I know the property box-shadow is relatively old, and widely used. But when using it in excess, I say when applying box-shadow in 100 elements on the same page I have lost performance?
I did this first print with over 400 Divs, and look at the time of rendering You’ve crossed the red line... just like the load was but slow, probably by having more code "raw" in the document
Now with about 50 div see in the red markings that the render is more subtle, nor does the red line appear. Notice the red arrows of this image and compare with the other above
Apparently the SPF in both cases was 100% (60fps)
I realize that when I have an "abusive" use of this property, and even when I have animations where the elements have box-shadow the machine gives a performance "gargalada", mainly in mobile...
- That question of
box-shadowvs hardware performance really proceeds affects the animations and the scroll of the page? - An alternative would be to use the property
filter: drop-shadow()? - This can harm the user’s experience of Accessibility and the SEO result with a page that renders more slowly?
Reference article I found: https://medium.com/airbnb-engineering/css-box-shadow-can-slow-down-scrolling-d8ea47ec6867
Code I used in the test
div {
width: 50px;
height: 50px;
background-color: #999;
border-radius: 10px;
box-shadow: 5px 5px 5px rgba(0, 0, 0, 0.5);
display: inline-block;
margin: 10px;
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Great question, too bad you can only reward answers
– Costamilam
Dude we’re talking about second milestones, which there is no practical applicability, what else might be weighing your rendering is the number of Ivs and not the property itself.
– Marcos Brinner
@Guilhermecostamilam was worth young! Let’s see if any answer appears that contemplates some of the points, often we focus on the layout and lose in performance... how can we measure this right...
– hugocsl
@Marcosbrinner if you think that not everyone has an iPhone and that there are mobile devices with very low processing capacity, the abuse of this and other properties can be a worrying factor, so I asked the question... Sometimes someone has something more concrete to share.
– hugocsl
Actually I can not say whether it affects or not, but it is a great question and I am very interested to know the answer eheheh.
– Renan
@Renanosorio I gave a researched, and the subject is even well discussed and documented there, but it’s kind of complex, I did not find anything in Portuguese, or that had a didactic of fac understanding. Let’s see if anyone with more information cooperates with a response.
– hugocsl