1. Performance Measurement and Monitoring for
Salesforce Web & Mobile Apps
Sudatta Gautham, salesforce.com, Senior Manager – Performance
@sudatta

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3. Sudatta Gautham
Senior Manager – Performance
Engineering
@sudatta

4. Agenda
Introduction
Understanding Web Performance
 Understanding Waterfall
 The Tools
 Lighthouse – A salesforce.com tool
Understanding Mobile Performance
 Paparazzi!
Monitoring for Web & Mobile perf

5. How Fast is Web?*
* Random sample video

6. Another Example- www.cnn.com *
 Only 1.2s spent on server side
 At 6.5s – page is actionable
 Page is visually complete at 9.5s
* Random sample video

7. Understanding the Waterfall Chart
Server Time
JS Exec Time

8. The Waterfall Chart – Key Metrics
 Server Response Time
 Network Roundtrips
 “Gaps” – JS Execution Times
 Time To OnLoad
 Resource sizes
 Time Taken to Various Page Components
 Response codes

9. Web Performance Tools – Free!
Tool Feature
Firebug Waterfalls, JS Debugger
DynatraceAJAX Javascript Profiling
Webpagetest Waterfall, Video capture, Automated tests
PageSpeed Analysis and best practice suggestions
HttpArchive Key web performance metrics

10.  Synthetic Monitoring
 Mash up of
 Webpagetest
 Showslow
 HTTPArchive
 DynatraceAJAX
 Built on Amazon Web Services including EC2, EBS

11. Lighthouse – What do we use it for?

12. Lighthouse – 301 Redirects
Before After
Page load time improved by 60% after the fix!

13. Lighthouse – What does it offer?
Real Browsers Uses selenium like scripting
Jiffy Integration Dynatrace Integration Alerting
Video comparison & headers Regression Analysis ShowSlow Integration
Charting/Trending
Waterfall analysis Screen shots
Multi browser/location/page charting Traffic Shaping HTTPArchive
Integration Free!!
Javascript Hotspots
Object level detail Javascript performance

14. Lighthouse – A Demo

15. Understanding Mobile Performance

16. Mobile Performance - Challenges
 Varying Network characteristics
 Benchmarking – 3G vs. WiFi?
 Connection latencies
 Varying client characteristics
 Native vs. HTML5
 Browser vs. Container
 Lack of Performance Tools

17. Mobile Performance – Our Journey
 Started with a Stopclock!!
 Weinre
 Custom Markers + Selenium based testing
 Headless browser – using PhantomJS
 Paparazzi

18. Paparazzi – Mobile Performance Tool
 A native app for mobile developer (Available on Android Marketplace!)
 Features are in BETA
 To understand web performance on mobile devices
 Overall loading time
 Page rendering snapshots
 Waterfall charts
 CPU, Memory and Network info
 Mobile bookmarklet information
 Page Resource Optimizations

19. Paparazzi - Workflow
•Loading info
•Snapshots
•Metadata
•Metrics
Web Server
Url
Loads webpages in Webview

20. Demo - Paparazzi
Poster by Pulse Advertising

21. Web Performance Monitoring
Gomez Keynote Lighthouse
Real Web Browsers Yes Yes Yes
Geo Coverage Yes Yes Yes, limited
Client Type Firefox, IE iOS, Android (emulators and Firefox, IE, Chrome
real device)
Network Type Used by Backbone and Last Mile 3G Backbone
salesforce.com
Detailed Render Performance No, Network only No, Network Yes, network, KPIs & JS
Summary Best for high level 24/7 monitoring Best for mobile, good for high Best for detailed real web browser
with synthetic transactions level 24/7 monitoring with performance on synthetic orgs, 24/7
synthetic transactions monitoring

22. Summary – Our Toolbox
Web/Mobile performance
UI Performance Mobile Performance
Monitoring
Firebug Paparazzi Keynote
Webpagetest Mobitest Gomez
Showslow Weinre Lighthouse
Pagespeed
Lighthouse

23. Sudatta Gautham
Speaker Title,
@sudatta

25. Web Performance Basics – Few Rules
 Make Fewer HTTP Requests
 Use a Content Delivery Network (CDN)
 Add an expires header
 Gzip Components
 Put Stylesheets at the Top
 Put Scripts at the Bottom
 Reduce DNS Lookups
 Minify JavaScript
 Avoid Redirects
 Remove Duplicate Scripts
 Make AJAX Cacheable

26. Web Performance Basics – Few More Rules
 Split the initial payload
 Load scripts without blocking
 Split dominant content domains (Domain Sharding)
 Make static content cookie-free (Cookieless Domains)
 Reduce cookie weight
 Minify CSS
 Optimize images
 Use iframes sparingly
 Early Flush

27. Mobile Performance – Recommendations
Network Roundtrips are Important
 Keep a connection alive
Perceived performance can help
Caching is still unreliable