Drastic change in Shopify Store: Prestige theme

Technical Q&A

Topic summary

A Shopify store owner experienced a dramatic speed decrease during the Christmas period—from 12-15 seconds to 30 seconds—despite making no major changes or code installations. Testing with a previous theme version that previously performed well showed the same slowdown, suggesting an external factor.

Current Performance:

  • Mobile speed score: 24/100 on PageSpeed Insights
  • GTmetrix shows significantly degraded metrics

Identified Issues:

  • Improperly sized images
  • Unused JavaScript from third-party apps

Recommended Solutions:

  • Select a lightweight Shopify theme (OS 2.0 compatible)
  • Remove unused/inactive Shopify apps
  • Minify CSS and JavaScript files
  • Reduce large image sizes and apply lazy loading per section
  • Replace GIFs with static images
  • Resize product images in bulk using Shopify apps
  • Eliminate JavaScript render-blocking issues

Responders offered speed optimization services and free website audit reports. The issue remains unresolved, with the store owner seeking tutorial links or actionable guidance to implement improvements independently.

Summarized with AI on November 23. AI used: claude-sonnet-4-5-20250929.
1

We continuously monitor our speed on google speed insights and gtmetrix. In Christmas vacation we didn’t monitor or did any big coding installation still our speed went like 12-15seconds to 30seconds. I tried my previous copy of theme which was working well. but all of sudden speed is decreased. Can anyone of you help me solve it or give me some tutorial links so I can make changes of my own and improve speed.

website link Bryan & Candy

Google Speed Insights
Google Speed Insights1920×10384 1.4 MB

GTMetrix
GTMetrix1509×837 103 KB

2

PageSpeed Insights tool: https://pagespeed.web.dev/report?url=https%3A%2F%2Fbryanandcandy.com%2F

onecommerce_0-1673346212559.png
onecommerce_0-1673346212559.png1135×747 83.8 KB

Hi there, As checking, your speed performance is now around 24/100 for mobile which is pretty slow.

There are 2 problems that affect your speed performance, which are improper-sized images or unused javascript from 3rd-party apps.

Therefore, you can re-check your theme to solve those problems or try speed-optimized service. for more information, you can contact us at julia@onecommerce.io or WhatsApp: +61 3 9028 6983

3

Hi @Harpal1

I am Naaz From MS Web Designer (Top Rated Shopify Certified Expert from Singapore ). I helped 1500+ Shopify Store owners to Optimize their website loading speed for both mobile and desktop and increase their conversion rate.

Here are some proven steps that will improve your website speed dramatically for both mobile and desktop.

  • Select a light Weight Shopify Theme ( OS 2.0 Compatible )
  • Remove all Unwanted Shopify App ( That you have installed, but not using)
  • Minify Javascript, CSS
  • Reduce the Large Image Size
  • Eliminating the halting problem in Javascript
  • Apply Lazy loading per section wherever required
  • Replace Gifs with the Static Images
  • Resize Products images using Shopify App ( for Bulk )
  • Check Page Speed by Google page Insight and GTmetrix.

By fixing these issues, your website speed score will definitely improve.

If you want a Free complete Website Optimization Audit Report ( All the Actionable steps for your store ), let me know.

If you have any concerns feel free to ask me!

Good luck !

Regards,
Naaz