Is there a solution in Webflow to address CSS and Javascript optimization for improving the PageSpeed Score?

Webflow offers several built-in tools and best practices to improve your PageSpeed Score by optimizing CSS and JavaScript. Here's how you can take advantage of them:

1. Use Webflow's Built-In Code Optimization

• Minification of CSS and JS is automatically enabled by Webflow for published sites on Webflow Hosting.
• Unused styles and interactions are stripped out on compilation to reduce file size.
• Webflow wraps custom code in async or defer tags intelligently when applicable.

2. Reduce Use of Custom Code

• Excessive or unoptimized custom JavaScript/CSS can block rendering and increase load times.
• Avoid large libraries (e.g., jQuery, GSAP) unless necessary. Use native Webflow interactions where possible.
• When needed, add <script> tags in the Before section in Page Settings to avoid render-blocking.

3. Limit DOM Size and Reflows

• Too many nested elements or large CMS lists can slow down JavaScript execution and increase layout shifts.
• Use Collection List Pagination or Load More (via Finsweet Attributes or minimal custom code) to reduce initial DOM size.

4. Optimize Animations and Interactions

• Avoid page-load animations that use heavy scripting or trigger reflows.
• Use Webflow native animations, which are optimized for performance and often tied to hardware acceleration.

5. Defer or Remove Third-Party Scripts

• Third-party JavaScript (e.g. Google Fonts, analytics, chat widgets) adds extra blocking resources.
• Where possible:
• Use async or defer for external scripts.
• Load scripts conditionally on user interaction (like opening a modal).
• Replace slow services with lightweight versions (e.g., Plausible Analytics instead of Google Analytics).

6. Preconnect and Lazy Load Assets

• Webflow automatically applies lazy loading to images using the loading="lazy" attribute.
• You can manually add a <link rel="preconnect"> tag in the Page Settings > Custom Code to preconnect to domains like Google Fonts or Stripe.

7. Disable Unused Webflow Features

• If you're not using Webflow's ecommerce, form submissions, or interactions, these scripts may still load.
• Use tools like Finsweet's Webflow Script Manager to selectively disable core Webflow scripts where appropriate.

Summary

Webflow automatically minifies and optimizes CSS/JS, but for best PageSpeed results, you should minimize use of custom code, reduce DOM complexity, lazy load assets, and selectively load third-party scripts. Tools like Finsweet’s Script Manager can further improve optimizations when needed.