Buy with Prime vs Quick Announcement Bar: Shopify Performance Comparison
Both apps score Grade C — Quick Announcement Bar has the edge with 8 ms vs 19 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 | Buy with Prime | Quick Announcement Bar | Faster |
|---|---|---|---|
| Overall Grade | C | C | Tie |
| JS Payload | 184.43 KB | 172.13 KB | Quick Announcement Bar |
| CPU Desktop | 19 ms | 8 ms | Quick Announcement Bar |
| CPU Mobile | 121 ms | 48 ms | Quick Announcement Bar |
| Layout Shift | 0.0006 | 0.0 | Quick Announcement Bar |
Mobile CPU measured with 4× CDP throttle (mid-range Android). Tested 2026-05-30.
Quick Announcement Bar — The Faster Option (Grade C)
Quick Announcement Bar scores Grade C with a JS payload of 172.13 KB and 8 ms desktop CPU execution. Mobile CPU: 48 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 Quick Announcement Bar speed report →
Buy with Prime — The Heavier Option (Grade C)
Buy with Prime scores Grade C with a JS payload of 184.43 KB and 19 ms desktop CPU execution. Mobile CPU: 121 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 Buy with Prime speed report →
When to Choose Buy with Prime
- 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 Quick Announcement Bar
- 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 — Quick Announcement Bar has the edge with 8 ms vs 19 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 2026-05-30.