The Trade Desk vs Zephyr Shopify DataLayer: Shopify Performance Comparison
Both apps score Grade B — The Trade Desk has the edge with 5 ms vs 18 ms desktop CPU execution.
Both apps provide heatmaps, session recording, and analytics functionality for Shopify stores. This page presents StackConflict’s independent lab results for both — measured in a clean-room environment with no other apps installed.
Head-to-Head Metrics
| Metric | The Trade Desk | Zephyr Shopify DataLayer | Faster |
|---|---|---|---|
| Overall Grade | B | B | Tie |
| JS Payload | 37.88 KB | 64.5 KB | The Trade Desk |
| CPU Desktop | 5 ms | 18 ms | The Trade Desk |
| CPU Mobile | 10 ms | 49 ms | The Trade Desk |
| Layout Shift | 0.0006 | 0.0006 | The Trade Desk |
Mobile CPU measured with 4× CDP throttle (mid-range Android). Tested 2026-05-30.
The Trade Desk — The Faster Option (Grade B)
The Trade Desk scores Grade B with a JS payload of 37.88 KB and 5 ms desktop CPU execution. Mobile CPU: 10 ms. It passes every StackConflict threshold for payload, CPU, and layout stability — making it safe to install on any storefront including mobile-first stores where Time-to-Interactive directly impacts conversion.
View full The Trade Desk speed report →
Zephyr Shopify DataLayer — The Heavier Option (Grade B)
Zephyr Shopify DataLayer scores Grade B with a JS payload of 64.5 KB and 18 ms desktop CPU execution. Mobile CPU: 49 ms. Performance is acceptable but worth monitoring, particularly on stores with high mobile traffic share.
View full Zephyr Shopify DataLayer speed report →
When to Choose The Trade Desk
- You need its specific features and can monitor its mobile impact
- Your other apps are lightweight (Grade A) so there is headroom
- You are on desktop-skewed traffic where CPU cost matters less
When to Choose Zephyr Shopify DataLayer
- You need its specific features and can monitor its mobile impact
- Your other apps are lightweight (Grade A) so there is headroom
- You are on desktop-skewed traffic where CPU cost matters less
Performance Verdict
Result: Comparable — Both apps score Grade B — The Trade Desk has the edge with 5 ms vs 18 ms desktop CPU execution.
About This Test
StackConflict measures each Shopify app in an isolated clean-room environment — a single development store, no other scripts, Playwright-controlled browser. V8 CPU cost is the ScriptDuration delta before and after injection. CLS is captured from the same browser session. Results represent the median of three independent runs with outliers removed.
Data from the StackConflict Lab. Last updated 2026-05-30.