Kiwibank

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

• Kiwibank

• Phone

  2.8 MB

• Laptop

  2.9 MB

First visitiReturningi

1. Homepage

   /

   First visit

   Phone 2.8 MB

   Laptop 2.9 MB

   Returning

   Phone 1.0 MB

   Laptop 1.0 MB

2. Mortgages

   /personal-banking/home-loans/

   First visit

   Phone 2.3 MB

   Laptop 2.4 MB

   Returning

   Phone 0.42 MB

   Laptop 0.47 MB

3. Credit cards

   /personal-banking/credit-cards/

   First visit

   Phone 2.1 MB

   Laptop 2.2 MB

   Returning

   Phone 0.26 MB

   Laptop 0.23 MB

4. Everyday accounts

   /personal-banking/accounts/

   First visit

   Phone 2.1 MB

   Laptop 2.1 MB

   Returning

   Phone 0.27 MB

   Laptop 0.28 MB

5. Contact

   /contact-us/

   First visit

   Phone 2.2 MB

   Laptop 2.1 MB

   Returning

   Phone 0.33 MB

   Laptop 0.34 MB

• Kiwibank’s own files

  This website

  1.8 MB66%

• Google Tag Manager

  Tag manager

  0.55 MB20%

• Facebook

  Advertising and social

  0.17 MB6%

• Optimizely

  Analytics

  0.11 MB4%

• 4 more companies

  Qualtrics, Analytics, 0.07 MB
  LinkedIn Ads, Advertising and social, 0.02 MB
  Google Analytics, Analytics, 0.02 MB
  YouTube, Video, 0.02 MB

  0.13 MB4%

• Images

  1.5 MB

• Scripts

  1.1 MB

• Fonts

  0.07 MB

• Other

  0.06 MB

• Styles

  0.05 MB

1. Image · Kiwibank

   3e5bf043b8d4452a910e52cd1dd1b7b6.gif

   Every page

   0.52 MB

2. Image · Kiwibank

   915faeb59c464c02bde69456e4efb007.jpg

   Homepage

   0.41 MB

3. Image · Kiwibank

   f092bfb54efa4f428e5de4b6166f7bea.jpg

   Homepage

   0.26 MB

4. Script · Google Tag Manager

   gtm.js

   Every page

   0.21 MB

5. Script · Google Tag Manager

   googletagmanager.com/gtag/js

   Every page

   0.19 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. Choice

   Check every marketing tag still earns its place: 5 companies

   Every page · several companies

   up to 0.31 MB

2. Fix

   Turn 1 animated GIF into video

   Every page · Kiwibank Phone

   up to 0.19 MB

3. Fix

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

   Every page · Kiwibank

   up to 0.15 MB

If this website had 100,000 page views a year, they would cause about 16 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. Kiwibank’s is 1.73 MB.