Maor Frankel

Making Your Grandparents Happy

With Web App Performance Monitoring

 

Maor Frankel

Real Users!

  • Medium/Old Phones
  • Medium/Old Computers
  • Slow Internet

WHY don't we accommodate?

  • Maybe - You don't care
  • Or maybe  - You don't know...

Total Kilobytes

http archive

onLoad

http archive

  • New web application, optimised for performance
  • Over time, app became bigger, and slower
  • We were in denial
  • Users complained

background: #story;

What to do?

  • Put out the fires - good
  • How to prevent this from happening again? - better

MONITORING

  • Availability
  • Functionality
  • API Monitoring
  • Synthetic Performance Tests
  • ?

Real Time User Monitoring (RUM)

Real Data, Real Users, Real Time

Third Parties

"This is the time it takes the page to load. It begins when the navigation begins and ends when the webpage has completed loading in the user’s browser"

Page Load?

 

 pageLoadTime = loadEventStart - navigationStart

 

BUILD YOUR OWN

Leverage our existing systems

The Plan!

Web Performance API

"The High Resolution Time standard defines a Performance interface that supports client-side latency measurements within applications. "

const then = performance.now();
console.log(then) // 3157728.1249999944 

(function doSomething() {
    for(let i=0 ; i < 10000 ; i++){
    ///DO SOMETHING...
    
    }
})()

const now = performance.now();
console.log(now) // 3158311.935000005
console.log((now - then)) // 583.8100000107661

Good

performance.mark('doSomething-start')

function doSomething() {
    for(let i=0 ; i < 10000 ; i++){    
     ///DO SOMETHING...
    }
}

performance.mark('doSomething-end')
performance.measure('doSomething', 'doSomething-start', 'doSomething-end')
let marks = performance.getEntriesByName('doSomething', 'mark')
console.info(`${marks[1].startTime - marks[0].startTime}`) // 583.8100000107661

Better

<!doctype html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <base href='/'/>
  <title>Outbrain - Amplify</title>
  <script>
    performance.mark('page-load-start');
  </script>

Marking key sections

<script>performance.mark('scripts-start');</script>

<script src="https://u.outbrain.com/static/vendor.87b3e412.js"></script>

<script src="https://u.outbrain.com/static/app.10f8627e.js"></script>

<script>performance.mark('scripts-end');</script>

Marking key sections

setDatasource(dataSource) {
   this.showGridLoadingOverlay()  
   performance.mark('reports-start')    
}


whenGridRenderComplete() {
   performance.mark('reports-end')
   this.hideGridLoadingOverlay()      
}

Marking key sections


performance.measure('ob_css', 'css-start', 'css-end');
performance.measure('ob_scripts', 'scripts-start', 'scripts-end');
performance.measure('ob_total_page', 'total-page-start', 'reports-end');

Measuring the metrics


const measures = performance.getEntriesByType('measure');
    .filter(msr => msr.name.includes('ob_'))
    .map(msr => {
      return {
        name: msr.name,
        duration: parseInt(msr.duration),
        speed: connection ? connection.effectiveType : ''
      }
    });

//Fall back to http post
navigator.sendBeacon('/performance-benchmark', { measures });

Phoning home

 this.app.post('/performance-benchmark', this.performanceBenchmark.observe);

 async observe(req: express.Request, res: express.Response) {
   const events: BenchmarkEvent[] = this.parseEvents(req.body);
   this.metrics[`${event.name}_country`].observe(
            {
              app: event.app,
              browser: event.browser,
              speed: event.speed,
              country,
            },
            event.duration
          )
   })    
    return res.sendStatus(200);
  }

Phoning home

Putting

it all together

The Gotchas

Reduce

The Noise

Big Data

Tracking

Memory Leaks

console.log(performance.memory);

// Would show, for example
{
 jsHeapSizeLimit: 767557632,
 totalJSHeapSize: 58054528,
 usedJSHeapSize: 42930044
}

Performance.memory

const MAX_MEMORY_LIMIT = 1000 * 1048576; // 1000MB

setInterval(() => {
    if(performance.memory.usedJsHeadSize > MAX_MEMORY_LIMIT){
    
    //fire alert
    }
}, 60000*30);

Performance.memory

SUCCESS!

  • Reduced load time from 20s to less then 9s (75 quentile)
  • Raised developers awareness
  • Better correlation between changes and performance issues

ETC...

  • If your not monitoring it, it doesn't exist 
  • Dev time is not real time
  • Before you pay for it, try to build it

 QUESTIONS? 

Thank You For Listening!

http://tinyurl.com/y4y4b64j

@Mr_Frankel

@MrFrank

Making your grandparents happy with web app performance monitoring

By Maor Frankel

Making your grandparents happy with web app performance monitoring

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