Transcy vs Weglot: Shopify Performance Comparison
Both apps score Grade C — Weglot has the edge with 21 ms vs 34 ms desktop CPU execution.
Both apps provide store translation and localization 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 | Transcy | Weglot | Faster |
|---|---|---|---|
| Overall Grade | C | C | Tie |
| JS Payload | 194.01 KB | 211.48 KB | Transcy |
| CPU Desktop | 34 ms | 21 ms | Weglot |
| CPU Mobile | 193 ms | 68 ms | Weglot |
| Layout Shift | 0.0 | 0.0005 | Transcy |
Mobile CPU measured with 4× CDP throttle (mid-range Android). Tested 2026-05-30.
Weglot — The Faster Option (Grade C)
Weglot scores Grade C with a JS payload of 211.48 KB and 21 ms desktop CPU execution. Mobile CPU: 68 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 Weglot speed report →
Transcy — The Heavier Option (Grade C)
Transcy scores Grade C with a JS payload of 194.01 KB and 34 ms desktop CPU execution. Mobile CPU: 193 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 Transcy speed report →
When to Choose Transcy
- 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 Weglot
- 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 — Weglot has the edge with 21 ms vs 34 ms desktop CPU execution.
Both apps carry Grade C — see StackConflict’s full Translation 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 2026-05-30.