University of Portsmouth - 10007155ACTIVE

Emissions

• URL: https://www.port.ac.uk/

  Time to load: 0.9 seconds

  Date checked	CO2 / grams	Page size	Energy
  2023-12-07	0.70	2.8MB	GRID?
  2022-09-06	0.52	868kB	GRID?
  2022-06-09	0.67	1.1MB	GRID?
  2022-04-12	0.65	1.1MB	GRID?
  2022-02-01	0.55	905kB	GRID?
  2021-11-03	0.72	1.2MB	GRID?
  2021-10-06	0.67	1.1MB	GRID?
  2021-09-01	0.67	1.1MB	GRID?
  2021-07-29	1.56	2.6MB	GRID?
  2021-06-30	0.52	870kB	GRID?
  2021-06-01	0.47	785kB	GRID?

  Tip: Optimise images

  We estimate potential to save at least 559kB* by optimising images:

  1. webimage-01A1B5DE-72... is 194kB and could be 123kB smaller
  2. webimage-5953336F-29... is 160kB and could be 105kB smaller
  3. webimage-EF76DF62-1C... is 154kB and could be 101kB smaller
  4. webimage-8EC3FB02-84... is 151kB and could be 94kB smaller
  5. webimage-5981A12B-E4... is 110kB and could be 69kB smaller
  6. webimage-F00E356D-C8... is 104kB and could be 66kB smaller
  7. SR01554021_1123_Home... is 96kB

  First, check that images are appropriately sized - you most likely don't need a 6000x4000 pixel image straight from a digital camera. In Windows, the Photos software will let you quickly shrink huge images and will give you an improvement.

  Next you could try using tinyjpg.com (JPG image) or tinypng.com (PNG image) to further optimise your image. This will strip out metadata that may be taking up lots of space.

  *This is an estimate from Google PageSpeed and you may get much better results than this in practice.

  Tip: Large files

  Aside from images, here are the biggest resources:

  1. gtm.js?id=GTM-WHX6C84 is 136kB
  2. main.MTdjYzNiZDU2MA.js is 109kB
  3. Aero-Bold.woff is 102kB

  The page uses 1 font which requires 102kB. Could system fonts be used instead?

  Tip: Limit third-party code

  Here are the largest sources of third-party code:

  1. Google Tag Manager uses 388kB
  2. TikTok uses 160kB
  3. Facebook uses 131kB
  4. Google Fonts uses 126kB
  5. JSDelivr CDN uses 115kB
  6. VWO uses 105kB
  7. YouTube uses 72kB
  8. cookiefirst.com uses 63kB

  Third-party code can significantly impact load performance. Limit the number of redundant third-party providers and try to load third-party code after your page has primarily finished loading.