Electron performance and C++ in Mailspring

Nov 2, 20171 like944 views

High level overview of Electron performance tips and tricks, and a look at the new C++ architecture of Mailspring (https://getmailspring.com/) — presented Nov. 1st at the Bay Area Electron Meetup

Electron Performance
and C++ in Mailspring
(or: what I’ve been up to for the last six months!)

Me
• Mac & iOS ➡ React & Electron
• Run a small team doing React /
mobile dev, now working on
Mailspring.
• Led the team building Nylas
Mail from 2014–2016.

Nylas Mail ➡ Mailspring
• May 2017: Nylas API business booming—engineers
pulled from Nylas Mail to ﬁght growth ﬁres!
• Sept 2017: Nylas Mail ofﬁcially sunset, re-licensed
under MIT. 🎉
Mailspring: Fix longstanding issues, use Pro version
revenue to run service and pay core contributors.

Electron performance and C++ in Mailspring

☄
Complaints about Nylas Mail
• Long startup time
• High battery impact
• Uses too much RAM*
Electron
😡 😤🚀🔥

• Long startup time
• High battery impact
• Uses too much RAM*
👷(
Complaints about Nylas Mail
Electron

Reducing startup time
• Start loading a BrowserWindow as fast as possible
• Watch out for sync I/O in main process
• Use the ASAR format in production
• Load less JavaScript (on launch)

Devtron
• Easy to ﬁnd heavy dependencies and see total JS
loaded.
• `request` is 910k of JS. Can you use Fetch APIs? 
`bluebird` is 180k of JS. Can you use native Promise?
Nylas Mail

Devtron
Mailspring
• Easy to ﬁnd heavy dependencies and see total JS
loaded.
• `request` is 910k of JS. Can you use Fetch APIs? 
`bluebird` is 180k of JS. Can you use native Promise?

Devtron
• Some things you can’t avoid… but you can load
later. Who needs spellcheck in the ﬁrst 500ms?
More UI Plugins SpellcheckerCore Window
Interactive in 1.0s

Energy Impact
Sync all mail, restart Mac, hide
applications, wait 15 minutes

Reducing Energy Impact
• Check for animations / needless layout
• Minimize use of setTimeout, setInterval. Don’t
wake and perform work if you don’t need to.
• Attach an event listener to `blur` that toggles
a CSS class, use it to prevent animations.

Checking for Animations
Loading indicator with opacity: 0 animating forever!

setTimeout / setInterval
• Use smarter polling strategies:
• Change polling rate based on Electron
PowerMonitor state.
• Poll when important events occur (window
focus event) rather than all the time.

But… what if it’s not enough?
• Need to sync mail every few minutes,
sometimes this requires polling.
• Need to keep IDLE connections open
to mail providers.
• Need to keep streaming connection
open to Mailspring server.
👷(😭 😢

Architecture
Observable SQLite Database
(electron-rxdb)

Enter C++
• Command line C++ processes replace the
background “work” window.
• Read actions on stdin, write JSON event
stream to stdout.
• Main window spawns these processes, binds to
their stdio streams, and re-broadcasts events.

C++ tradeoffs
• In JavaScript, control ﬂow is hard. 
(Promises, async/await, etc.)
• In C++, control ﬂow is easy but memory is hard.
(Sync I/O on a few threads.)
• The SQLite bindings for C are incredibly fast.
• Shipping C++ cross-platform is hard.

C++ is kind of… pretty?
• The C++11 syntax is really elegant.
• Modern features like condition_variable allow
the sync engine to do almost no polling.

Memory Use
805MB 368MB
MailspringNylas Mail

Takeaways
• Keep your dependencies light, use built-in APIs
when possible. Check require tree with Devtron!
• Use “Paint Flashing” to identify crippling CSS /
layout issues. Minimize timer use if possible.
• Combining Electron and C++ (or Haskell, or Go,
etc.) isn’t that crazy.

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