Minimise render blocking request in Horizon theme to improve page speed

Topic summary

  • Main issue: A Shopify store owner wants to improve mobile page speed in the Horizon theme. Google PageSpeed Insights flags render‑blocking requests tied to a file named styles.css, but the user can’t find this file in the theme code.

  • Context: “Render‑blocking” refers to CSS/JS resources that must load before the page can display content, delaying first paint and hurting mobile performance.

  • Evidence: An attached PageSpeed Insights screenshot highlights the render‑blocking resource (image is central for specifics).

  • Request: Guidance on how to locate and minimize or eliminate the render‑blocking styles.css in the Horizon theme (e.g., where it resides and what steps to take).

  • Outcome/status: No answers or solutions yet. The thread remains open with unresolved questions about identifying and fixing the render‑blocking CSS.

Summarized with AI on December 10. AI used: gpt-5.

Hi,

I am trying to optimise the mobile experience and improve page speed. Page speed insights has identified render blocking requests related to styles.css in Horizon theme, but I am unable to find this in the theme code. Can anyone advise how do I go about this? Below information.