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🔬 Lab Findings 🔧 Stack Builder

Personalization Apps for Shopify — Performance Ranked

5 benchmarked personalization and product recommendations apps, ranked by real JavaScript overhead measured in StackConflict's clean-room lab.

5 Apps benchmarked
0 Grade A or B
45 ms Avg CPU cost
180 ms Avg mobile CPU
★ 4.9 Avg merchant rating
FASTEST

Bold Product Options is the lightest personalization and product recommendations app we've tested — 247.58 KB payload and 11 ms CPU (Grade C).

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#1
C
Bold Product Options
by Bold Commerce
📦 247.58 KB
⚡ 11 ms desktop
📱 98 ms mobile ✓
📐 Layout stable
Heavy
#2
C
Dynamic Yield
by Mastercard
📦 434.64 KB
⚡ 13 ms desktop
📱 66 ms mobile ✓
📐 Layout stable
★ 5 2
Heavy
#3
C
Optimizely
by Optimizely
📦 292.24 KB
⚡ 37 ms desktop
📱 142 ms mobile ✓
Heavy
#4
C
Personizely
by Personizely
📦 418.65 KB
⚡ 37 ms desktop
📱 157 ms mobile ✓
📐 Layout stable
★ 5 85
Heavy
#5
D
Rebuy
by Rebuy Engine
📦 732.41 KB
⚡ 126 ms desktop
📱 475 ms mobile ✓
★ 4.7 818
Critical

How we measure — Each app is injected into a clean Shopify dev store in a Playwright-controlled browser with no other apps installed. V8 CPU cost is the ScriptDuration delta before and after injection. Mobile estimate applies Google Lighthouse's 4× slowdown factor.

Read the full methodology →