BNZ

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

• BNZ

• Phone

  2.6 MB

• Laptop

  2.6 MB

First visitiReturningi

1. Homepage

   /

   First visit

   Phone 2.6 MB

   Laptop 2.6 MB

   Returning

   Phone 1.2 MB

   Laptop 1.3 MB

2. Mortgages

   /personal-banking/home-loans

   First visit

   Phone 3.0 MB

   Laptop 2.8 MB

   Returning

   Phone 1.6 MB

   Laptop 1.5 MB

3. Credit cards

   /personal-banking/credit-cards

   First visit

   Phone 2.8 MB

   Laptop 2.8 MB

   Returning

   Phone 0.47 MB

   Laptop 0.53 MB

4. Everyday accounts

   /personal-banking/everyday-banking

   First visit

   Phone 3.2 MB

   Laptop 3.2 MB

   Returning

   Phone 0.87 MB

   Laptop 0.88 MB

5. Contact

   /contact

   First visit

   Phone 2.5 MB

   Laptop 2.5 MB

   Returning

   Phone 1.2 MB

   Laptop 1.1 MB

• BNZ’s own files

  This website

  1.4 MB55%

• Google Tag Manager

  Tag manager

  0.72 MB28%

• TikTok

  Advertising and social

  0.16 MB6%

• Facebook

  Advertising and social

  0.16 MB6%

• 4 more companies

  Dynatrace, Analytics, 0.08 MB
  LinkedIn Ads, Advertising and social, 0.02 MB
  Google Analytics, Analytics, 0.02 MB
  Marketo, Analytics, 0.01 MB

  0.13 MB5%

• Unknown source

  0.01 MB0%

• Scripts

  2.2 MB

• Images

  0.24 MB

• Fonts

  0.10 MB

• Styles

  0.05 MB

• Other

  0.01 MB

1. Script · BNZ

   vendors.js

   Every page

   0.75 MB

2. Image · BNZ

   Everday-banking-maj-feat-app-V2.png

   Everyday banking

   0.38 MB

3. Image · BNZ

   Everday-banking-maj-feat-app-mobile-2x-V2.png

   Everyday banking

   0.25 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. Fix

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

   Every page · BNZ

   up to 0.54 MB

2. Fix

   Resize 21 images to the size screens show them

   Every page · BNZ

   at least 0.50 MB

3. Choice

   Check every marketing tag still earns its place: 7 companies

   Every page · several companies

   up to 0.34 MB

4. Fix

   Compress 19 of your own text files

   Every page · BNZ

   at least 0.25 MB

5. Fix

   Send next pages as differences from the last one (shared compression dictionaries), in Chrome, Edge and other Chromium browsers. Safari and Firefox do not support it yet.

   Home loans and 3 more · BNZ Laptop

   Home loans, Credit cards, Everyday banking, Contact us

   up to 0.12 MB

If this website had 100,000 page views a year, they would cause about 21 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. BNZ’s is 2.27 MB.