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SrikanthPo3
Level 5
July 21, 2025
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How to get CDN URL for Marketo Newsletter subscription form

  • July 21, 2025
  • 1 reply
  • 551 views

Hi,

We are using Marketo script (for example landing.mycompany.com/js/forms2/js/forms2.min.js) to use Newsletter subscription form on our website, this script takes 2-3 seconds load time which has impact on overall page load time.

I am looking for ways to optimize Marketo script, please suggest if there are any alternate approaches. We are using loading this asynchronously. Also, even though we are loading the above script only once, we see a second call in the browser network tab, the 2nd call takes about 1 second time. When checked with Marketo support on 2nd network, support team mentioned that this could not be avoided.

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Best answer by SanfordWhiteman

Don’t know what you mean by “get CDN URL” as the Forms 2.0 library is already served via Cloudflare.

 

2-3 seconds is highly aberrant. This is the typical waterfall for an uncached forms2.min.js one of our instances. It’s never over 200 milliseconds:

 

What is the actual URL you’re loading (don’t obfuscate it, it’s not secret!) and what country are you connecting from?

 

(P.S. In general, please don’t use somebody else’s domain as a placeholder. Only example.com is suitable for this purpose.)

 

Also, even though we are loading the above script only once, we see a second call in the browser network tab, the 2nd call takes about 1 second time. When checked with Marketo support on 2nd network, support team mentioned that this could not be avoided.

The forms library also loads in a transport IFRAME. It has zero effect on page performance.

 

 

1 reply

SanfordWhiteman
SanfordWhitemanAccepted solution
Level 10
July 21, 2025

Don’t know what you mean by “get CDN URL” as the Forms 2.0 library is already served via Cloudflare.

 

2-3 seconds is highly aberrant. This is the typical waterfall for an uncached forms2.min.js one of our instances. It’s never over 200 milliseconds:

 

What is the actual URL you’re loading (don’t obfuscate it, it’s not secret!) and what country are you connecting from?

 

(P.S. In general, please don’t use somebody else’s domain as a placeholder. Only example.com is suitable for this purpose.)

 

Also, even though we are loading the above script only once, we see a second call in the browser network tab, the 2nd call takes about 1 second time. When checked with Marketo support on 2nd network, support team mentioned that this could not be avoided.

The forms library also loads in a transport IFRAME. It has zero effect on page performance.

 

 

    SanfordWhiteman
    SanfordWhiteman
    Level 10
    July 22, 2025

    @srikanthpo3 please return to your thread and check responses.

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