charles vs Salesforce Embedded Service Messaging: Shopify Performance Comparison
Salesforce Embedded Service Messaging wins with Grade B vs Grade C — a one-grade performance difference that compounds on mobile devices.
Both apps provide live chat and customer support 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 | charles | Salesforce Embedded Service Messaging | Faster |
|---|---|---|---|
| Overall Grade | C | B | Salesforce Embedded Service Messaging |
| JS Payload | 241.69 KB | 52.87 KB | Salesforce Embedded Service Messaging |
| CPU Desktop | 48 ms | 4 ms | Salesforce Embedded Service Messaging |
| CPU Mobile | 67 ms | 26 ms | Salesforce Embedded Service Messaging |
| Layout Shift | 0.0 | 0.0006 | charles |
Mobile CPU measured with 4× CDP throttle (mid-range Android). Tested 2026-05-30.
Salesforce Embedded Service Messaging — The Faster Option (Grade B)
Salesforce Embedded Service Messaging scores Grade B with a JS payload of 52.87 KB and 4 ms desktop CPU execution. Mobile CPU: 26 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 Salesforce Embedded Service Messaging speed report →
charles — The Heavier Option (Grade C)
charles scores Grade C with a JS payload of 241.69 KB and 48 ms desktop CPU execution. Mobile CPU: 67 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 charles speed report →
When to Choose charles
- 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 Salesforce Embedded Service Messaging
- 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: Salesforce Embedded Service Messaging — Salesforce Embedded Service Messaging wins with Grade B vs Grade C — a one-grade performance difference that compounds on mobile devices.
Install Salesforce Embedded Service Messaging →
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.