Introduction to Interaction to Next Paint (INP)
Interaction to Next Paint (INP) is a crucial metric for measuring how quickly a web page responds to user input. It is so important that the HTTPArchive has a comparison of INP across content management systems. INP measures how responsive a web page is to user interactions during a visit, specifically measuring interaction latency, which is the time between when a user clicks, taps, or presses a key and when the page visually responds.
What Is Interaction To Next Paint (INP)?
INP is a more accurate measurement of responsiveness than the older metric it replaced, First Input Delay (FID), which only captured the first interaction. INP is more comprehensive because it evaluates all clicks, taps, and key presses on a page and then reports a representative value based on the longest meaningful latency. The INP score is representative of the page’s responsive performance. For that reason, extreme outliers are filtered out of the calculation so that the score reflects typical worst-case responsiveness.
Importance of INP Scores
Web pages with poor INP scores create a frustrating user experience that increases the risk of page abandonment. Fast responsiveness enables a smoother experience that supports higher engagement and conversions. INP scores have three ratings: Good (Below or at 200 milliseconds), Needs Improvement (Above 200 milliseconds and below or at 500 milliseconds), and Poor (Above 500 milliseconds).
Content Management System INP Champions
The latest Interaction to Next Paint (INP) data shows that all major content management systems improved from June to July, but only by incremental improvements. Joomla posted the largest gain with a 1.12% increase in sites achieving a good score. WordPress followed with a 0.88% increase in the number of sites posting a good score, while Wix and Drupal improved by 0.70% and 0.64%. Duda and Squarespace also improved, though by smaller margins of 0.46% and 0.22%.
CMS INP Ranking By Monthly Improvement
The ranking of content management systems by monthly improvement is as follows:
- Joomla: +1.12%
- WordPress: +0.88%
- Wix: +0.70%
- Drupal: +0.64%
- Duda: +0.46%
- Squarespace: +0.22%
Which CMS Has The Best INP Scores?
The July INP results show a different ranking order of content management systems when viewed by overall INP scores. Squarespace leads with 96.07% of sites achieving a good INP score, followed by Duda at 93.81%. Wix and WordPress are ranked in the middle with 87.52% and 86.77% of sites showing a good INP score, while Drupal, with a score of 86.14%, is ranked in fifth place, just a fraction behind WordPress.
CMS INP Rankings for July 2025
The ranking of content management systems by INP scores is as follows:
- Squarespace – 96.07%
- Duda: 93.81%
- Wix: 87.52%
- WordPress: 86.77%
- Drupal: 86.14%
- Joomla: 84.47%
What About Shopify’s INP Performance?
Shopify has strong Core Web Vitals performance, but how well does it compare to these six content management systems? When Shopify is added to the INP comparison, the rankings change. Shopify is ranked number three, with 89.58% of sites achieving a good INP score.
Top Ranked Shopping Platforms By INP
The ranking of shopping platforms by INP scores is as follows:
- BigCommerce: 95.29%
- Shopify: 89.58%
- WooCommerce: 87.99%
CMS And Shopping Platforms Comparison
The ranking of content management systems and shopping platforms by INP scores is as follows:
- Squarespace: 96.07%
- BigCommerce: 95.29%
- Duda: 93.81%
- Shopify: 89.58%
- WooCommerce: 87.99%
- Wix: 87.52%
- WordPress: 86.77%
- Drupal: 86.14%
- Joomla: 84.47%
Conclusion
INP measures the responsiveness of a web page, making it a meaningful indicator of user experience. The latest data shows that while every CMS is improving, Squarespace, BigCommerce, and Duda outperform all other content platforms in this comparison by meaningful margins. All of the platforms in this comparison show high percentages of good INP scores, indicating that all platforms are delivering a quality experience for users.