Co-operative Bank

1. Oct 2026

First measured October 2026.

1. SBS Bank, 1.23 MB
2. ASB, 1.40 MB
3. TSB, 1.42 MB
4. Heartland Bank, 1.71 MB
5. Kiwibank, 1.73 MB
6. Westpac, 1.74 MB
7. ANZ, 2.01 MB
8. Co-operative Bank, 2.03 MB
9. BNZ, 2.27 MB

1. C
2. C
3. D
4. D
5. D
6. D
7. E
8. E
9. E

LightestHeaviest

• Co-operative Bank

• Phone

  3.5 MB

• Laptop

  4.0 MB

First visitiReturningi

1. Homepage

   /

   First visit

   Phone 3.5 MB

   Laptop 4.0 MB

   Returning

   Phone 1.0 MB

   Laptop 1.1 MB

2. Mortgages

   /borrowing/home-loans

   First visit

   Phone 2.5 MB

   Laptop 2.9 MB

   Returning

   Phone 0.01 MB

   Laptop 0.01 MB

3. Credit cards

   /cards-and-payments/our-cards/credit-card

   First visit

   Phone 2.8 MB

   Laptop 2.9 MB

   Returning

   Phone 1.3 MB

   Laptop 1.3 MB

4. Everyday accounts

   /everyday-banking

   First visit

   Phone 1.6 MB

   Laptop 1.6 MB

   Returning

   Phone under 0.01 MB

   Laptop under 0.01 MB

5. Contact

   /contact-us

   First visit

   Phone 1.8 MB

   Laptop 1.8 MB

   Returning

   Phone 0.18 MB

   Laptop 0.18 MB

• Co-operative Bank’s own files

  This website

  1.8 MB50%

• YouTube

  Video

  0.95 MB27%

• Google Tag Manager

  Tag manager

  0.54 MB15%

• Facebook

  Advertising and social

  0.20 MB6%

• 2 more companies

  Google Fonts, Hosting and delivery, 0.03 MB
  Other Google APIs/SDKs, Utility, 0.02 MB

  0.06 MB2%

• Unknown source

  0.01 MB0%

• Scripts

  2.2 MB

• Images

  1.0 MB

• Fonts

  0.23 MB

• Styles

  0.11 MB

• Other

  0.03 MB

1. Image · Co-operative Bank

   co-operativebank.co.nz/api/content/document/21390

   Homepage and 1 more

   1.4 MB

2. Image · Co-operative Bank

   co-operativebank.co.nz/api/content/document/21391

   Homepage and 1 more

   0.93 MB

3. Image · Co-operative Bank

   co-operativebank.co.nz/api/content/document/20565

   Co-operative Bank Fair Rate Credit Card

   0.90 MB

4. Script · YouTube

   base.js

   Homepage

   0.48 MB

5. Script · Co-operative Bank

   index-BkLQS8NO.js

   Every page

   0.26 MB

Fix

Nothing a visitor would notice

Choice

Removes or delays something

Worked out on a phone and a laptop. The icons show where each saving applies.

1. Fix

   Resize 5 images to the size screens show them

   Co-operative Bank Fair Rate Credit Card and 1 more · Co-operative Bank Phone

   Co-operative Bank Fair Rate Credit Card, Contact us

   up to 0.45 MB

2. Fix

   Ship less of your own code: scripts and styles that did not run while the homepage loaded

   Every page · Co-operative Bank

   up to 0.24 MB

3. Choice

   Check every marketing tag still earns its place: 1 company

   Every page · Facebook

   up to 0.15 MB

4. Fix

   Compress 9 of your own text files

   Every page · Co-operative Bank

   up to 0.15 MB

5. Fix

   Cut 5 fonts down to the characters used

   Every page · Co-operative Bank

   up to 0.07 MB

If this website had 100,000 page views a year, they would cause about 18 kg of carbon emissions.

Built to grade A (under 0.53 MB a page), the same page views would cause about 4.8 kg.

A grade C badge needs a typical page under 1.41 MB. Co-operative Bank’s is 2.03 MB.