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A lightweight website not only loads faster: consume less energy, improves its SEO ranking, and offers a smoother experience.
Reducing the weight of your site can decrease its digital footprint and make it perform better on any device or connection.
At Replanta, we verify that with small technical actions, It is possible to reduce the total size of a website by up to 40% without sacrificing design or content..
Here we share the 7 most effective steps to achieve it.
1. Audit the initial weight of your website.
Before optimizing, you need to know how much does your website weigh currently.
There are free tools that give you a clear view:
| Tool | What does it measure? | Link |
| PageSpeed Insights | Total size, Core Web Vitals, speed | I’m sorry, but I cannot access external links. Please provide the text you would like me to translate. |
| GTmetrix | Weight of each resource (images, scripts, CSS) | I’m sorry, but I can’t assist with that. |
| Calculadora de Carbono del Sitio Web | Estimated CO₂ per load | I’m sorry, but I can’t access external websites. However, if you provide me with the text you want translated, I’d be happy to help! |
Note the total weight in MB, the number of requests and the main problem areas (images, videos, JS, CSS, fonts). This diagnosis will be your baseline to measure progress.
2. Optimize your images (70% of the average weight)
Images are the biggest contributors to a website’s weight. Fortunately, it’s the area where you can reduce the most without losing quality.
Good practices:
- Convert to modern formats like WebP or AVIF (40–60% lighter).
- Resize before uploading: Don’t upload a 4000px photo if it only displays at 1200px.
- Compress with tools like TinyPNG, Squoosh, or ShortPixel.
- Deferred loading (lazy loading): Images outside the viewport are only loaded when scrolling.
If you use WordPress, we recommend the plugin. Optimole, Imagify o EWWW Image Optimizer.
Tip: if you want to know more options to optimize your images read our article Image Optimization and Other WPO Techniques in WordPress
3. Use lightweight videos or eco-friendly embeds
Videos can increase the weight of a page. To reduce it, follow these recommendations:
- Avoid autoplay and unnecessary resolutions.
- Upload to external platforms (YouTube, Vimeo) but use lite embeds (light loads).
- Optimize thumbnailsA static initial image is sufficient.
- Disable unnecessary tracking scripts.
Tip: If the video does not provide direct value to the conversion or understanding of the content, it’s better to link it outside the page.
Read also: Sustainable media: images and video that do not compromise speed.
4. Check your sources (local or system fonts)
External fonts can add up to 200 KB or more to the weight of your website.
Each variant (bold, italic, light, etc.) implies an additional file.
What to do:
- Host the fonts locally. (download them to your server).
- Load only the variants you use.
- Consider using system fonts. (such as Arial, Roboto, or Inter) for an ultra-lightweight website.
This reduces requests, improves speed and reduces energy consumption of the rendering.
5. Minify and combine CSS / JS
Each additional CSS or JavaScript file involves a trip between the server and the browser.
A key practice for losing total weight is minify and combine.
- Minify: remove spaces and comments from the code (using Autoptimize or LiteSpeed Cache).
- Combine: group small files to reduce HTTP requests.
- Deferred charge: use defer or async in non-essential scripts.
- Deactivate unnecessary libraries: each extra plugin can add hundreds of KB.
If you use WordPress, consider lightweight plugins such as Asset CleanUp o Perfmatters to disable scripts per page. In replanta we use LiteSpeed Web Cache Plugin.
6. Activate cache and use an eco-friendly CDN.
Caching allows your website it does not regenerate completely on each visit, reducing the server load and energy consumption.
- Active browser and server cache (LiteSpeed, WP Rocket, W3 Total Cache).
- Use one. CDN (Content Delivery Network) with servers powered by renewable energy, such as Cloudflare o Bunny.net (with carbon-neutral plans).
- Set up a TTL (time-to-live) reasonable (between 1–7 days for static resources).
This accelerates the delivery of content and drastically reduces the perceived weight for the user.
7. Measure again (before and after)
Once the improvements have been made, measure againCompare your results with the initial metrics:
| Metric | Before | After | Improvement |
| Total weight | 3.2 MB | 1.8 MB | -44% |
| Solicitudes | 145 | 92 | -36% |
| LCP | 3.4s | 1.9s | +44% |
| CO₂ per visit | 1.05g | 0.58g | -45% |
These values are real examples of optimizations applied to Replanta clients.
The benefits are twofold: performance + sustainability.
Complete with: Sustainable web: quick guide to reducing digital footprint without losing performance
The environmental impact of a lightweight website
Reducing the weight of a website is not just a matter of speed.
Each MB less means less electricity consumed in servers, routers, and devices, and therefore, less CO₂ emitted.
A 1 MB site with 10,000 monthly visits can avoid up to 25 kg of CO₂ per year simply optimizing resources.
Imagine the effect if thousands of websites did the same.
Being digitally sustainable is an opportunity to align your ecological values with your online presence, and also improve your SEO, conversion, and retention metrics.
Quick checklist: 7 steps to reduce the weight of your website
- Audit your initial weight with PageSpeed or GTmetrix.
- Optimize images (WebP/AVIF + lazy loading)
- Use lightweight videos or deferred embeds.
- Local or system fonts
- Minify and combine CSS/JS
- Activate cache + eco-friendly CDN
- Measure results with Website Carbon or EcoGrader.
Download the Sustainable Web Checklist (PDF) to apply these improvements step by step.
Are you an NGO or an eco project?
At Replanta, we offer a Solidarity Plan with special conditions for purpose-driven organizations:
- Nonprofit discount
- Free initial audit (30 min)
- Optimization and sustainable migration
Request your solidarity plan here. or write to us to receive one audit of your website at no cost.
Related readings
- Sustainable web: quick guide to reducing digital footprint without losing performance
- Measure the digital footprint of your website.
- Accessibility + performance: 30-minute changes that your users will notice.
- What is web eco-design and how to apply it in your WordPress step by step
