Skio — Performance Grade C
Heavy — high conversion risk
Skio is a subscription billing and recurring orders app for Shopify that scores Grade C overall in StackConflict’s independent performance lab. The grade is driven entirely by its download payload: our lab recorded 150.62 KB of JavaScript — a heavy JavaScript bundle that will delay first-paint on slower mobile connections, placing it in the C-tier for network cost. Notably, once downloaded, the script executes very efficiently: only 33 ms of desktop CPU time (Grade A), meaning the bottleneck is connection speed and first-paint delay, not main-thread execution.
The practical impact for Shopify merchants is a longer first-paint on slower connections. A 150.62 KB download must complete before the script can initialise — on a mid-range mobile connection (10 Mbit/s) this adds roughly 118 ms of network latency before the browser even begins execution. Once the script does load, it runs quickly: the 4× Lighthouse mobile throttle estimates only ~132 ms (~0.13s) of CPU execution — well within acceptable limits. For merchants on high-speed connections or desktop-dominant traffic, the payload cost is far less noticeable than on mobile-heavy, emerging-market stores.
Verdict (Grade C — Heavy): If Shopify store speed and mobile conversion are priorities, merchants should evaluate lighter alternatives before committing to Skio. StackConflict has benchmarked Loop Subscriptions and Subify in the same subscriptions category — both carry Grade A or B ratings with significantly lower payload and CPU profiles. The performance difference compounds on mobile-first stores where JavaScript parse, compile, and execution times are amplified by device limitations.
Lab Results
| Metric | Value | Grade |
|---|---|---|
| JS Payload | 150.62 KB | C |
| CPU Execution (desktop) | 33 ms | A |
| CPU Execution (mobile est.) | ~132 ms | — |
| Cumulative Layout Shift | 0.0 | A |
| Overall Grade | — | C |
| Category | Subscriptions | — |
| Last tested | 2026-05-28 | — |
Lab Verdict
Grade C driven by large download payload. Monitor mobile conversion impact carefully.
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 |
Faster Alternatives
These subscriptions apps have earned a Grade A or B in our lab and are drop-in alternatives worth evaluating:
Real-World Production Benchmarks
StackConflict replayed 1 distinct merchant bundle variant in the clean-room shell — each representing a different merchant’s enabled feature set.
| Metric | Value |
|---|---|
| Median CPU (production variants) | 27 ms |
| Best-case merchant config | 27 ms |
| Worst-case merchant config | 27 ms |
| Merchant variants sampled | 1 |
All variants: 27 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.).
Often Installed With
Based on StackConflict’s scan of live Shopify stores, found on 1 scanned storefronts, these apps frequently appear alongside Skio:
- Richpanel — seen together in 1 store(s)
About This Test
StackConflict measures app performance in a clean-room environment. Each app’s JavaScript bundle is injected into an owned Shopify development store via a Playwright-controlled browser, with no other third-party apps installed. V8 CPU cost is the ScriptDuration delta measured before and after injection on the same live page. Mobile CPU estimate applies the 4× Lighthouse slowdown factor to approximate real-device impact.
Data sourced from the StackConflict Lab. Last updated 2026-05-28.