B
Acceptable
Performance Optimized
Does Webgains Slow Down Shopify?
Download size is within acceptable range. Monitor conversion impact on mobile storefronts.
📦 Network B 64.09 KB
⚡ CPU ?
⏳ Pending live store measurement
— lab estimate not used in grade
📐 Layout A Stable (CLS 0)
🛡️ May run sandboxed via Shopify Web Pixels — analytics/marketing
scripts in this category often execute off the main thread. Actual storefront
impact may be lower than measured.
Acceptable — monitor on mobile
Webgains is a heatmaps, session recording, and analytics app for Shopify that scores Grade B in StackConflict’s independent benchmark — placing it among the better-performing apps in the Analytics category. With a moderate JavaScript bundle that is acceptable but worth monitoring as your stack grows (64.09 KB compressed), it adds minimal friction to the storefront experience.
StackConflict’s profiler measures apps on real Shopify storefronts with a 4× mobile CPU throttle to capture actual merchant-side impact. Live CPU data for Webgains will appear here automatically once the profiler completes its next run. The payload grade (B) is based on the measured 64.09 KB JavaScript bundle — larger bundles increase Time-to-Interactive on slower mobile connections regardless of CPU cost.
Verdict (Grade B — Acceptable): Webgains by Webgains is a safe choice from a Shopify site speed perspective. It passes all StackConflict thresholds for payload, CPU, and layout stability. Install it with confidence on any storefront, including high-traffic mobile-first stores where JavaScript overhead directly influences Add-to-Cart conversion rates and Google’s Core Web Vitals ranking signals.
Lab Results
| Metric | Value | Grade |
|---|
| JS Payload | 64.09 KB | B |
| CPU Execution | Pending live store measurement | ? |
| Cumulative Layout Shift | 0.0 | A |
| Overall Grade | — | B |
| Category | Analytics | — |
| Last tested | 2026-06-03 | — |
Lab Verdict
Download size is within acceptable range. Monitor conversion impact on mobile storefronts.
Grading Scale
Each app is graded across three independent dimensions. The final grade is the worst of the three — no dimension can be hidden by a good score elsewhere.
| Grade | Payload | CPU (desktop) | CLS | Risk |
|---|
| A | ≤ 30 KB | ≤ 50 ms | < 0.1 | Lightweight — zero friction |
| B | ≤ 150 KB | ≤ 150 ms | < 0.25 | Acceptable — monitor on mobile |
| C | ≤ 500 KB | ≤ 500 ms | < 0.5 | Heavy — high conversion risk |
| D | > 500 KB | > 500 ms | ≥ 0.5 | Critical — avoid on mobile stores |
Real-World Production Benchmarks
StackConflict replayed 1 distinct merchant bundle variant — each representing a different merchant’s enabled feature set.
| Metric | Value |
|---|
| Median CPU (production variants) | 14 ms |
| Best-case merchant config | 14 ms |
| Worst-case merchant config | 14 ms |
| Merchant variants sampled | 1 |
All variants: 14 ms. The spread between best and worst case reflects how much the app’s JavaScript footprint changes when merchants enable heavy features (AI chatbots, video reviews, complex filter UIs, etc.).
About This Test
StackConflict measures app performance on real live Shopify merchant stores.
Each app is profiled using a Playwright-controlled browser with 4× CPU throttle
and mobile viewport — matching Google Lighthouse’s mid-range Android benchmark.
V8 CPU cost is the ScriptDuration delta captured via Chrome DevTools Protocol.
Results are the median across multiple live stores to filter out theme noise.
Install Webgains
Data sourced from the StackConflict Lab. Last updated 2026-06-03.