Kiwi Sizing vs Variant Option Product Options: Shopify Performance Comparison
Variant Option Product Options wins with Grade B vs Grade D — a significant performance difference that compounds on mobile devices.
Both apps provide personalization and product recommendations 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 | Kiwi Sizing | Variant Option Product Options | Faster |
|---|---|---|---|
| Overall Grade | D | B | Variant Option Product Options |
| JS Payload | 521.05 KB | 53.55 KB | Variant Option Product Options |
| CPU Desktop | 70 ms | 3 ms | Variant Option Product Options |
| CPU Mobile | 331 ms | 19 ms | Variant Option Product Options |
| Layout Shift | 0.0 | 0.0 | Kiwi Sizing |
Mobile CPU measured with 4× CDP throttle (mid-range Android). Tested 2026-05-31.
Variant Option Product Options — The Faster Option (Grade B)
Variant Option Product Options scores Grade B with a JS payload of 53.55 KB and 3 ms desktop CPU execution. Mobile CPU: 19 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 Variant Option Product Options speed report →
Kiwi Sizing — The Heavier Option (Grade D)
Kiwi Sizing scores Grade D with a JS payload of 521.05 KB and 70 ms desktop CPU execution. Mobile CPU: 331 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 Kiwi Sizing speed report →
When to Choose Kiwi Sizing
- 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 Variant Option Product Options
- 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
Winner: Variant Option Product Options — Variant Option Product Options wins with Grade B vs Grade D — a significant performance difference that compounds on mobile devices.
Install Variant Option Product Options →
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.