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Shopify Performance

Speed is a conversion lever, not a vanity score. A faster store converts more of the traffic you already pay for. These posts cover Core Web Vitals on Shopify, the Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift, with the exact Liquid, image, and script fixes I use to get stores under Google’s thresholds, plus the measured cost of the apps that slow them down.

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23 posts in Performance

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  1. Magento vs Shopify in 2026: Speed, Support Dates and Real Costs

    Magento vs Shopify in 2026 from a developer who works on both: Core Web Vitals pass rates, Magento support end dates, real costs, B2B and when to stay or move.

  2. WooCommerce vs Shopify in 2026: Real Costs, Speed and Upkeep

    WooCommerce vs Shopify in 2026 from a developer who builds on both: the real monthly bill for a $40K store, Core Web Vitals pass rates, upkeep, switching.

  3. Shopify Developer for Furniture Stores: The Fix Order and the Price

    Shopify developer for a furniture store? The fix order from two real home goods stores: sales up 51%, mobile LCP from 22.0s to 2.7s, and what the work costs.

  4. Shopify Developer for Jewelry Stores: What a Fine Jeweler Needed Fixed

    Shopify developer for a jewelry store? A real fine jeweler case study: 25,285 duplicate links, a broken metal picker, and all 5 Core Web Vitals green.

  5. Shopify Speed Optimization Case Study: Mobile 38 to 81

    Shopify speed optimization case study: mobile PageSpeed 38 to 81 and LCP 22.0s to 2.7s on a real blinds store. The 5 fixes, the code, and a free PDF checklist.

  6. Is Your Slow Shopify Store Actually Losing Sales?

    Is your slow Shopify store losing sales, or is it something else? How to prove whether speed is your problem, what the loss is worth, and when it pays to fix.

  7. How to Hire a Shopify Speed Optimization Service (2026)

    How to hire a Shopify speed optimization service in 2026: the 5 questions to ask, why a guaranteed Lighthouse score is a red flag, and what it should cost.

  8. Shopify Recently Viewed Products Without an App (Copy-Paste)

    Recently viewed products on Shopify without an app: copy-paste Liquid and vanilla JS with localStorage. No monthly fee, no blocking time, full code inside.

  9. Shopify Speed Optimization: How to Speed Up Your Store (2026)

    Shopify speed optimization, step by step: how to speed up your store by finding what costs you most (apps, images or theme code) and fixing the heaviest first.

  10. Shopify Horizon vs Dawn in 2026: Migrate or Stay?

    Shopify Horizon vs Dawn: there is no automatic migration, so moving to Horizon is a full rebuild. When switching is worth the layout-shift risk, and when not.

  11. Shopify Font Loading: Kill FOIT and FOUT Without the CLS Tax (2026)

    Fix Shopify font FOIT and FOUT with font-display, size-adjust, and ascent-override. Eliminate CLS from font swap. Works with Dawn, OS 2.0, and Google Fonts.

  12. Shopify CLS Survival Guide: 6 Layout Shift Killers in Liquid Themes (2026)

    The 6 patterns behind 90% of Shopify CLS failures, from unsized images and font swap shift to sticky headers and review widgets, with the Liquid fix for each.

  13. Sub-2s TTFB on Shopify: When Liquid Loops Cost You Real Money (2026)

    Slow Shopify TTFB is rarely Shopify's fault. 4 Liquid patterns push it past 2 seconds: nested loops, all_products, metafield N+1, deep sections. Fixes inside.

  14. Shopify Sub-1s LCP: 3 Hugo-Style Tricks Liquid Themes Can Steal (2026)

    Hit sub-1-second LCP on a Shopify theme with 3 tricks from static site generators: inline critical CSS, image_url with srcset and fetchpriority, hero preload.

  15. Hydrogen vs Liquid in 2026: When Headless Actually Wins

    Independent take from a 12-year Liquid dev. The 5% where Hydrogen earns its complexity, the 95% where it is a tax, and the CrUX numbers that prove it.

  16. Shopify image_url Filter: Sizes, Crop, Format (Complete 2026 Reference)

    Migrating img_url to image_url filter seems like find and replace, until one default breaks srcset. The parameter reference and fix, plus a free cheat sheet.

  17. Shopify Liquid For Loop Break and Continue: 5 Working Patterns

    Shopify Liquid break/continue look simple until nested loops hit one pattern that fails silently. All 5 working patterns, the gotcha, and the Dawn fix.

  18. Shopify Technical Audit Checklist: 25 Points I Run on Every Store (2026)

    The 25-point Shopify technical audit I run on every paid engagement. Liquid, schema, CWV, mobile, checkout, app stack. Real findings, fix priority, 2026.

  19. Shopify INP Fix: 612ms to 178ms (Real Store Case Study)

    Real Shopify Plus INP case study: p75 INP from 612ms to 178ms in 5 days. Diagnosed long tasks, patched JavaScript, 28-day CrUX delta. Passing Core Web Vitals.

  20. Shopify Speed Optimization with Liquid Code (5 Patterns)

    11 of 14 themes I audited blamed apps. The real fix: 5 Liquid code patterns that cut page load 1-2 seconds before you uninstall a single app. No plugin needed.

  21. Lighthouse vs CrUX: Why Shopify Scores 23 But Passes CWV

    Lighthouse vs CrUX on Shopify: a real Plus store scored 23 on mobile while passing every Core Web Vital in CrUX. Why the gap exists and when to worry.

  22. Shopify Core Web Vitals 2026: Fix LCP, INP, CLS in a Week

    22.0s to 2.7s LCP, mobile PageSpeed 38 to 81. The exact Liquid code, image fixes, and INP cuts that did it on one Shopify client. 30-min audit, week-long fix.

  23. Shopify Liquid Loop Optimization (forloop, for, limit)

    Cut Shopify Liquid render time 50 to 70 percent. forloop variables, limit, break, and the Liquid loop patterns that cut LCP from 22s to 2.7s on a real theme.
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