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State of HTML 2025

Performance

Making your site run even faster.

We're highlighting interesting features or libraries we think you should know about.

Feature Highlight: blocking="render"

Those of us who give a FOUC (Flash of Unstyled Content) about controlling how websites load will be happy to learn about blocking="render". As it name implies, this attribute can make a <link>, <script> or <style> tag block the page's rendering until they're fully loaded.

Browser support isn't quite there yet–but it's definitely something that will make web loading UX much smoother once it becomes widely supported.

Baseline: Limited Availability

Learn more

Useful Resources

Performance Experience & Sentiment

It's loud and clear: the DX of srcset and sizes could use improvement! Both ends of the spectrum are around it, with srcset/sizes itself topping the frustration list, and sizes="auto being the most liked feature—because it alleviates some of this pain.

Group by:

Sort by:

1
Performance
70.8%
21.9%
6.8%
4,636
2
Performance
68.3%
21.9%
9%
4,627
3
Performance
25.6%
30.8%
43.1%
4,613
4
Performance
19.8%
20.5%
59.3%
4,624
5
Performance
6.2%
25.2%
68.1%
4,607
6
Performance
4%
22.8%
72.8%
4,610
7
Performance
8.4%
88.9%
4,592

Experience

  • <span aria-hidden="true">🤓</span> Used it: Respondents who have used an item.
  • <span aria-hidden="true">👀</span> Heard of it: Respondents who have heard about an item, but haven't used it.
  • <span aria-hidden="true">🤷</span> Never heard of it: Respondents who have never heard about an item.

Sentiment

  • Positive: Respondents who are interested in learning more about a technology; or are willing to use it again.
  • Neutral: Responents who did not indicate any sentiment about a technology.
  • Negative: Respondents who are not interested in learning more about a technology; or have used it and had a negative experience.
“Used” average:28%
“Positive” average:34%
“Negative” average:3%

Performance Pain Points

The whole point of the web is to give people access to faraway content. Given that, it does feel a bit strange that loading that data is so often an afterthought, with little progress made in the last 30 years apart from slightly nicer spinner animations.
What are your pain points around performance?
Multiple
Top pain point topics overall.

View:

Items that are not one of “limitations”
0%
20%
40%
60%
80%
100%
01
Loading
4
02
Graphics
2
03
Ecosystem issues
2
04
Responsive design
05
Tooling
2
06
Poor design
1
07
Education
08
Cognitive overload
09
Excessive complexity
10
Core Web Vitals
1
11
Browser support
2
12
Debugging
13
Animations
14
End-user experience
1
15
Reliability
16
Typography
1
17
Reliance on JavaScript
18
19
workplace
20
21
preload
22
Server-client communication
23
Meta-issues
24
Other Answers
0%
20%
40%
60%
80%
100%
% of question respondents
355
6%
5

Recommended Resources

Web Performance Fundamentals, v2
Todd Gardner
Request Metrics

Web Performance Fundamentals, v2

Speed up your websites and web apps by mastering the latest performance metrics and web optimization techniques.
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