Converge — Performance Grade C
Heavy — high conversion risk
Converge is a heatmaps, session recording, and analytics app for Shopify that has been assigned Grade C by StackConflict’s independent performance lab — a below-average classification in our A–D grading scale. Our lab recorded a heavy JavaScript bundle that will delay first-paint on slower mobile connections (475.24 KB compressed) and a significant main-thread cost that can delay Time-to-Interactive on mid-range Android devices (173 ms desktop V8 execution). These figures place it in the C-tier for Shopify app performance.
On mobile devices, StackConflict’s 4× throttle pass measured Converge’s execution cost directly at 1131 ms (1.1s) on mid-range Android hardware. This is within a manageable range, but stacks additively with every other third-party script on your store. Merchants adding multiple apps should monitor combined mobile CPU load using StackConflict’s Stack Builder.
Verdict (Grade C — Heavy): If Shopify store speed and mobile conversion are priorities, merchants should evaluate lighter alternatives before committing to Converge. StackConflict has benchmarked Microsoft Advertising UET and The Trade Desk in the same analytics 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 | 475.24 KB | C |
| CPU Execution (desktop) | 173 ms | C |
| CPU Execution (mobile) | 1131 ms | — |
| Cumulative Layout Shift | 0.0 | A |
| Overall Grade | — | C |
| Category | Analytics | — |
| Last tested | 2026-05-30 | — |
Lab Verdict
Grade C driven by large download payload and high main-thread CPU cost. 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 analytics apps have earned a Grade A or B in our lab and are drop-in alternatives worth evaluating:
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 2026-05-30.