Measure Jetpack

Arūnas Liuiza

WordPress Core Contributor, WordPress Kaunas Meetup co-organizer, WordCamp Lithuania & WordCamp Riga speaker and one of the editors of the Lithuanian WordPress translation team.

 

Free & premium WordPress plugin developer:

WordPress Expert on Codeable;

Founder of Arunas.co and EcoSim / Vini.lt;

Lecturer at Kaunas College.

It all started with a
blog post...

TIL

  • Apparently, Jetpack is a contentious issue in WordPress Community ;) #wpdrama
     
  • Some people hate it, others swear by it.
     
  • Everybody has an opinion about it.

And what does the *DATA*
say about it all?

Well... 

  • There is not much of it.
     
  • An interesting study was conducted by BruteProtect
    • A part of Jetpack - clear conflict of interest

A proper study

  • Conducted by an independent party;
     
  • A clear, public methodology;
     
  • Reproduceable results;
     
  • Comparison to alternative plugins;

Parameters

System

  • WordPress 4.6.1
  • Jetpack 4.3.2
  • Twenty Sixteen 1.2
     
  • LEMP stack:
    • Ubuntu 14.04.4 LTS
    • nginx 1.4.6
    • PHP 5.5.9
    • MariaDB 5.5.47
  • Digital Ocean droplet
    • 1GB RAM
    • 1 CPU
    • 30GB SSD 
  • Nothing else running on it

Content

  • From Wikipedia
    • All countries
    • All capitals
    • Some cities
    • 600+ posts in total

What was measured?

  • Peak Memory Usage
  • PHP Execution Time
  • SQL Read Query Count
  • SQL Write Query Count
  • SQL Execution Time
  • Local Script/Style Request Count
  • Remote Sricpt/Style Request Count
  • Remote HTTP GET Request Count
  • Remote HTTP POST Request Count

How was it measured?

  • A custom lightweight plugin
     
  • Hooking in at 'shutdown' hook
     
  • Loading home page 9 times
     
  • Discard min and max values and count the average of remaining 7.

The RESULTS

Memory Usage

  • Activated Jetpack:
    • +0.47 Mb  / +14.11%
  • Activating a single Jetpack module:
    • +0.76 Mb / +22.82% on average
    • +0.69 Mb / +20.72%  for Infinite Scroll (min)
    • +1.09 Mb / +32.73%  for Sharing (max)
  • Activated Recommended modules:
    • +2.04 Mb  / +61.26%
  • Activated All modules:
    • +2.451 Mb / +73.57%

All figures are relative to fresh WP install (3.33 Mb of peak memory usage) 

Execution time

  • Jetpack adds +0.076 s of load time on average.
     
  • Big variations in results (+- 30%), so a bigger sample is needed for more reliable results.

All figures are relative to fresh WP install (0.1848 s execution time) 

SQL

  • Activated Jetpack
    • +1 read query
  • +2 read queries
    • Related posts, Custom CSS
  • +3 read queries
    • Extra Widgets, Infinite Scroll
  • +7 read queries
    • Recommended modules
  • +10 read queries
    • All modules

Assets

  • WordPress loads
    • 6 internal scripts, 5 internal sytles, 1 external style
  • Recommended modules add
    • +1 internal, +1 external script, +2 internal styles
  • All modules add
    • +11 internal, +2 external scripts, +11 internal styles
  • Culprit modules
    • Infinite Scroll ( +5/0/+6)
    • Gravatars ( +1/+1/0)
    • Photon ( +1/0/0)
    • Likes ( 0/0/+1)

Remote HTTP requests

Jetpack adds 0 new remote HTTP requests to home page loads.

Conclusions

What we've learned? 

  1. Jetpack will add at least 0.5 Mb (and up to 2.5 Mb) of peak memory usage on home page of a WordPress site;
     
  2. There is an effect on execution times, too, but a bigger sample size is needed for reliable comparison;
     
  3. Only a handful of Jetpack modules load additional assets to WordPress home page;
     
  4. Jetpack adds no remote HTTP requests on WordPress home page;

What's next? 

  1. Measure comparable alternative plugins;
     
  2. Run tests in module specific places (single post/admin screen/etc.);
     
  3. More data for execution time comparisons;

Main take-away

  • If You want control and flexibility
    • There are a lot of plugins that do what Jetpack does
       
  • If You want stability
    • Jetpack might be a great choice for you

Questions?

Measure Jetpack

By Arūnas Liuiza

Measure Jetpack

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