Dr Stacked Discounts on Cart vs UserWay: Shopify Performance Comparison
Both apps score Grade C — Dr Stacked Discounts on Cart has the edge with 16 ms vs 16 ms desktop CPU execution.
Both apps provide general Shopify store enhancement 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 | Dr Stacked Discounts on Cart | UserWay | Faster |
|---|---|---|---|
| Overall Grade | C | C | Tie |
| JS Payload | 213.87 KB | 173.76 KB | UserWay |
| CPU Desktop | 16 ms | 16 ms | Dr Stacked Discounts on Cart |
| CPU Mobile | 67 ms | 34 ms | UserWay |
| Layout Shift | 0.0 | 0.0005 | Dr Stacked Discounts on Cart |
Mobile CPU measured with 4× CDP throttle (mid-range Android). Tested 2026-05-31.
Dr Stacked Discounts on Cart — The Faster Option (Grade C)
Dr Stacked Discounts on Cart scores Grade C with a JS payload of 213.87 KB and 16 ms desktop CPU execution. Mobile CPU: 67 ms. Even as the faster of the two options, merchants on mobile-heavy stores should weigh its impact on their combined app stack.
View full Dr Stacked Discounts on Cart speed report →
UserWay — The Heavier Option (Grade C)
UserWay scores Grade C with a JS payload of 173.76 KB and 16 ms desktop CPU execution. Mobile CPU: 34 ms. This places it in the heavier half of StackConflict’s benchmark dataset — merchants running mobile-first stores should evaluate whether the feature value justifies the performance tradeoff.
View full UserWay speed report →
When to Choose Dr Stacked Discounts on Cart
- Its unique feature set has no lighter equivalent in StackConflict’s database
- Your store traffic is predominantly desktop
- You have already removed or lightened other heavy scripts to compensate
When to Choose UserWay
- Its unique feature set has no lighter equivalent in StackConflict’s database
- Your store traffic is predominantly desktop
- You have already removed or lightened other heavy scripts to compensate
Performance Verdict
Result: Comparable — Both apps score Grade C — Dr Stacked Discounts on Cart has the edge with 16 ms vs 16 ms desktop CPU execution.
Both apps carry Grade C — see StackConflict’s full General rankings for lighter alternatives.
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 2026-05-31.