yadyok.bogazici.edu.tr

The numbers

First visit

4.37 g CO₂e

Return visit

0.0036 g CO₂e

Hosting

unknown

LCP

6.54 s

CLS

0.001

TTFB

206 ms

At 10,000 views a month this page emits about 393.4 kg CO₂e a year, roughly 1612 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 ~1.38 g/visit (12.37 MB)High impact · quick fix

   42 images (27.50 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.

   • 2955-ogrenci-20251128-092937_600x400.jpg2.41 MB
   • 2459-kisiler-20251112-165346_600x400.jpg2.28 MB
   • 2945-akademik-ofisler-20251201-112356_600x400…2.08 MB
   • 2357-iletisim-dilekce-20251107-144649_600x400…1.95 MB
   • 2943-useful-links-20251128-084238_600x400.jpg1.71 MB

   WSG 2.9: Optimize media to reduce resource use
2. Serve images at the size they displaysave ~0.802 g/visit (7.21 MB)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.

   • 2955-ogrenci-20251128-092937_600x400.jpg2.41 MB
   • 2955-ogrenci-20251128-092937_600x400.jpg2.41 MB
   • 2955-ogrenci-20251128-092937_600x400.jpg2.41 MB
   • 2955-ogrenci-20251128-092937_600x400.jpg2.41 MB
   • 2955-ogrenci-20251128-092937_600x400.jpg2.41 MB

   WSG 2.9: Optimize media to reduce resource use
3. Lazy-load below-the-fold mediasave ~0.249 g/visit (2.24 MB)High impact · quick fix

   11 below-the-fold images/iframes (4.49 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.

   • 139-sabanci-universitesi-learners-centerdan-d…908 kB
   • 140-citok-seminerleri-20260515-114752_660x440…738 kB
   • 135-buept-bilgilendirme-oturumu-20260427-1119…705 kB
   • 69-koc-universitesi-alis-birimi-ile-is-birlig…492 kB
   • 137-yadyok-video-projesi-20260427-112805_660x…460 kB

   WSG 2.9: Optimize media to reduce resource use
4. Enable text compressionsave ~0.093 g/visit (839 kB)High impact · quick fix

   9 text resources (1.20 MB) are served without gzip/Brotli.

   Enable Brotli (or at least gzip) on the server or CDN for HTML, CSS, JavaScript, JSON and SVG. Typical reduction is ~70%.

   • main.css566 kB
   • bundle.js221 kB
   • all.min.css105 kB
   • jquery.min.js88 kB
   • fancybox.js68 kB

   WSG 4.3: Reduce data transfer with compression
5. Audit third-party servicessave ~0.025 g/visit (223 kB)Medium impact · moderate effort

   5 third-party domains account for 446 kB (2% 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.

   • fonts.gstatic.com272 kB
   • www.googletagmanager.com170 kB
   • fonts.googleapis.com4.7 kB
   • region1.google-analytics.com0 B
   • 0 B

   WSG 3.5: Treat third parties the same as first parties
6. Optimize web fontssave ~0.022 g/visit (201 kB)Medium impact · quick fix

   24 font files total 575 kB.

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

   • fa-solid-900.woff2159 kB
   • fa-brands-400.woff2119 kB
   • KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff243 kB
   • KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3KUBGEe.woff230 kB
   • 6xKtdSZaM9iE8KbpRA_hK1QN.woff228 kB

   WSG 2.11: Use optimized web typography
7. Reduce JavaScript payloadsave ~0.018 g/visit (163 kB)Medium impact · moderate effort

   9 scripts total 652 kB on the wire (977 kB 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.

   • bundle.js221 kB
   • js170 kB
   • jquery.min.js88 kB
   • fancybox.js68 kB
   • flatpickr.js51 kB

   WSG 3.2: Minify and remove unused codeWSG 3.3: Modularize bandwidth-heavy components
8. 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.txtThe host publishes a carbon.txt; its evidence has not reached the Green Web Foundation dataset yet.

   WSG 4.1: Use sustainable hosting
9. Set a page-weight budgetAdvisory · moderate effort

   At 29.49 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

Where the bytes are

• Images27.50 MB · 43 req
• CSS737 kB · 12 req
• JavaScript652 kB · 9 req
• Fonts575 kB · 24 req
• HTML24 kB · 1 req
• Data (fetch)362 B · 2 req