itu.edu.tr

The numbers

First visit

1.67 g CO₂e

Return visit

0.0059 g CO₂e

Hosting

unknown

LCP

1.11 s

CLS

0.588

TTFB

48 ms

At 10,000 views a month this page emits about 150.7 kg CO₂e a year, roughly 618 km in an average petrol car. The estimate assumes 75% new and 25% returning visitors, a measured cache reload ratio of 0%, and world-average grid intensity. How we calculate this

1. Convert and compress imagessave ~0.504 g/visit (4.53 MB)High impact · quick fix

   88 images (10.06 MB) ship in legacy formats (JPEG/PNG/GIF).

   Serve AVIF (or WebP) with responsive srcset sizes, and re-compress oversized files. AVIF typically halves JPEG weight at the same visual quality.

   • 8ac8681a-351d-450d-b49f-89e2e247d436.jpg1.77 MB
   • ui-greenmetric-2025.png1.16 MB
   • the-wur-by-subject-2026.png705 kB
   • itu-slider.jpg552 kB
   • pars-roket-grubu-sivi-yakit-test-660x368.png513 kB

   WSG 2.9: Optimize media to reduce resource use
2. Lazy-load below-the-fold mediasave ~0.382 g/visit (3.43 MB)High impact · quick fix

   20 below-the-fold images/iframes (6.87 MB) download immediately for every visitor.

   Add loading="lazy" to below-fold img and iframe elements (and keep it off the LCP image). Browsers then fetch them only when scrolling approaches.

   • 8ac8681a-351d-450d-b49f-89e2e247d436.jpg1.77 MB
   • ui-greenmetric-2025.png1.16 MB
   • pars-roket-grubu-sivi-yakit-test-660x368.png513 kB
   • 6882801c-81f5-432a-9c7d-d4bc47a3338d.jpeg409 kB
   • 9f54b2fc-e434-4a43-80d0-149d25250e22.jpeg392 kB

   WSG 2.9: Optimize media to reduce resource use
3. Serve images at the size they displaysave ~0.081 g/visit (728 kB)High impact · quick fix

   20 images are encoded at more than twice the pixels the layout shows, even accounting for this viewport's pixel density.

   Generate multiple sizes and let the browser pick with srcset/sizes; a 4000px original behind a 400px slot spends bandwidth no screen displays.

   • the-wur-by-subject-2026.png705 kB
   • the-wur-by-subject-2026.png705 kB
   • the-wur-by-subject-2026.png705 kB
   • the-wur-by-subject-2026.png705 kB
   • the-sustainability-impact-rating-2026.png148 kB

   WSG 2.9: Optimize media to reduce resource use
4. Audit third-party servicessave ~0.045 g/visit (400 kB)High impact · moderate effort

   14 third-party domains account for 800 kB (7% of the page).

   Remove services that no longer earn their place; load the rest on interaction (facades for embeds, delayed consent-gated tags). Each third party is also a privacy and performance dependency.

   • www.googletagmanager.com287 kB
   • fastly.jsdelivr.net110 kB
   • unpkg.com68 kB
   • cdnjs.cloudflare.com64 kB
   • a.tile.openstreetmap.org51 kB
   • c.tile.openstreetmap.org47 kB

   WSG 3.5: Treat third parties the same as first parties
5. Reduce JavaScript payloadsave ~0.027 g/visit (244 kB)High impact · moderate effort

   31 scripts total 975 kB on the wire (2.92 MB decoded). Bundles this size usually carry a lot of unused code.

   Split bundles per route, tree-shake dependencies, and audit with a bundle analyzer or coverage profile. A 25% cut is a conservative target for bundles this size.

   • js154 kB
   • js134 kB
   • vue.js106 kB
   • Telerik.Web.UI.WebResource.axd88 kB
   • Telerik.Web.UI.WebResource.axd46 kB

   WSG 3.2: Minify and remove unused codeWSG 3.3: Modularize bandwidth-heavy components
6. Verify your hosting energyMedium impact · moderate effort

   This host has not published renewable energy evidence with the Green Web Foundation, so its energy source is unknown.

   Choose a provider listed in the Green Web Directory, or ask your current provider to publish evidence (and a carbon.txt). This cuts the data-center share of every single page view.

   • carbon.txtNo carbon.txt found at the site root; publishing one is the lightest first step.

   WSG 4.1: Use sustainable hosting
7. Upgrade compression beyond gzipsave ~0.0098 g/visit (88 kB)Advisory · quick fix

   587 kB of text ships gzip-compressed; Brotli or Zstandard would cut roughly another 15-20%, and browsers without them fall back to gzip automatically.

   Serve precompressed Brotli for static text assets (highest level, compressed at build time) and enable Brotli or zstd for dynamic responses; keep gzip only as the fallback.

   • Telerik.Web.UI.WebResource.axd88 kB
   • Telerik.Web.UI.WebResource.axd46 kB
   • ScriptResource.axd44 kB
   • leaflet.js41 kB
   • ScriptResource.axd40 kB

   WSG 4.3: Reduce data transfer with compression
8. Optimize web fontssave ~0.0039 g/visit (35 kB)Advisory · quick fix

   4 font files total 118 kB, 4 not in WOFF2.

   Subset fonts to used glyphs, prefer one variable font over multiple weights, serve WOFF2 only, and consider system fonts for UI text.

   • subset-SourceSansPro-Regular.woff34 kB
   • subset-SourceSansPro-SemiBold.woff34 kB
   • subset-SourceSansPro-Bold.woff34 kB
   • itu-web-font-icons.ttf16 kB

   WSG 2.11: Use optimized web typography
9. Set a page-weight budgetAdvisory · moderate effort

   At 11.28 MB per view this page rates F. The findings above list where the weight is.

   Agree a transfer budget (e.g. under 975 kB reaches a B), enforce it in CI, and re-scan after each change to hold the line.

   WSG 3.1: Set goals based on performance and energy impact
10. Simplify the document structureAdvisory · larger effort

    The page renders 1551 DOM elements, above the 1,500 guideline. Large trees cost memory and CPU on every visitor's device.

    Flatten wrapper markup, render long lists virtually or paginate, and prefer semantic elements over nested divs.

    WSG 3.6: Ensure code follows good semantic practices

Where the bytes are

• Images10.06 MB · 89 req
• JavaScript975 kB · 31 req
• Fonts118 kB · 4 req
• CSS71 kB · 11 req
• HTML36 kB · 2 req
• Data (XHR)24 kB · 5 req
• Data (fetch)0 B · 1 req