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lcp-issues #502
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@coderabbitai help me fix
LCP issue: longer than 4s (mobile)
Improve page performance
Grade Suggestion
F34 Add Expires headers
Web pages are becoming increasingly complex with more scripts, style sheets, images, and Flash on them. A first-time visit to a page may require several HTTP requests to load all the components. By using Expires headers these components become cacheable, which avoids unnecessary HTTP requests on subsequent page views. Expires headers are most often associated with images, but they can and should be used on all page components including scripts, style sheets, and Flash.
F45 Compress components with gzip
Compression reduces response times by reducing the size of the HTTP response. Gzip is the most popular and effective compression method currently available and generally reduces the response size by about 70%. Approximately 90% of today's Internet traffic travels through browsers that claim to support gzip.
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@cohenaj194
To address the LCP issue on mobile devices, you can implement the following fixes:
Add Expires headers (F34):
Setting proper caching headers will allow browsers to cache static assets, reducing load times on subsequent visits.
In your Remix app, you can set
Cache-Control
headers in theloader
functions of your routes or in a sharedheaders
function. Here's how you can do it:For static assets like images, CSS, and JavaScript files served from the
public
directory, ensure that your hosting provider or CDN is configured to add appropriateCache-Control
headers. Since you're using Cloudflare, you can set up a Page Rule to add these headers:Compress components with gzip (F45):
Compression can significantly reduce the size of your assets.
If you're deploying to Cloudflare Workers, gzip or Brotli compression is automatically applied to your responses when the client supports it.
For further assurance, you can double-check your Cloudflare settings:
If you're using a custom server (like Express) with Remix, you can enable gzip compression using middleware:
For Remix Apps deployed on other platforms, refer to their documentation on enabling compression.
Additional Tips to Improve LCP:
<link rel="preload">
or<link rel="prefetch">
for critical assets.Implementing these changes should help reduce your LCP times on mobile devices. Let me know if you need further assistance!
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@coderabbitai use your learnings and grep through this repo to give more precise suggestions.
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@cohenaj194
After analyzing your codebase, I noticed that none of your loader functions are currently setting
Cache-Control
headers. This means that browsers may not be efficiently caching your server-rendered responses, contributing to the LCP issues on mobile devices.To improve caching and reduce load times, you can add
Cache-Control
headers to your loader functions. Here's how you can modify them:Apply this change to all your loader functions where appropriate. This tells the browser to cache the response, reducing the need to fetch the data again on subsequent visits.
Additionally, it appears that there's no usage of compression middleware like
compression()
in your codebase. If you're using a custom server with Express or a similar framework, you can enable gzip compression:However, since I didn't find a
server.js
orserver.ts
file, it's possible that you're deploying your Remix app directly to Cloudflare Workers or another platform that handles compression for you. In this case, ensure that Brotli compression is enabled in your Cloudflare settings:Additional Recommendations:
<link rel="preload">
or<link rel="prefetch">
for critical assets.Implementing these changes should help improve your LCP metrics on mobile devices. Let me know if you have any questions or need further assistance!
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