Third-Party Scripts and Embeds

The category “culprit” that surprises small business owners the most.

You install a chat widget here, a pop-up tool there, and a social feed block somewhere else, and over time you’ve created a performance problem without realizing it.

The most common third-party additions that will hurt your site:

• Live chat widgets (Intercom, Drift, Tidio)

• Behavior analytics tools (Hotjar, FullStory)

• Live social feed embeds

• Pop-up and email capture tools

• Tag managers loaded with excessive triggers

Each one adds JavaScript to the browser’s main thread and creates additional network requests.

The result is a delay in when the page’s largest visible element loads (LCP) and a sluggish response to taps and clicks (INP). These aren’t theoretical effects; they show up clearly in performance audits and are a key reason Squarespace includes a script audit in its page speed recommendations.

Ask yourself honestly: is this script producing measurable value, or was it just installed and then forgotten?

What to do with scripts you can’t remove

For tools your business genuinely needs, a booking widget or Google Analytics, for example, you still have options. Move custom code from Header Injection to Footer Injection to reduce render-blocking impact. Use async or defer attributes when adding custom scripts via code injection.