Tweet
Tweet

Slide 1

Slide 1 text

No content

Slide 2

Slide 2 text

SLOW FAST

Slide 3

Slide 3 text

D O W N LO A D RENDER PARSE

Slide 4

Slide 4 text

Lightweight ๏ Downloads fast. ๏ Parses fast. ๏ Renders fast. Responsive ๏ Tap or click → updates fast. ๏ Sophisticated animations. ๏ 60fps scrolling.

Slide 5

Slide 5 text

Lightweight ๏ Downloads fast. ๏ Parses fast. ๏ Renders fast. Responsive ๏ Tap or click → updates fast. ๏ Sophisticated animations. ๏ 60fps scrolling. TENSION

Slide 6

Slide 6 text

Virtual DOM

Slide 7

Slide 7 text

VIRTUAL DOM

Slide 8

Slide 8 text

Virtual DOM ๏ Compiles JSX to JavaScript ๏ Renders recursively, synchronously ๏ Pushes optimization responsibility to application code

Slide 9

Slide 9 text

No content

Slide 10

Slide 10 text

No content

Slide 11

Slide 11 text

1 3 2 Instant Templates 60fps Incremental Rendering Optimized Updates

Slide 12

Slide 12 text

1 Instant Templates

Slide 13

Slide 13 text

https://medium.com/@samccone/performance-futures-bundling-281543d9a0d5 DOWNLOAD PARSE COMPILE EXECUTE 130MS 200MS

Slide 14

Slide 14 text

https://medium.com/reloading/javascript-start-up-performance-69200f43b201

Slide 15

Slide 15 text

function Weather(weather) { return [

Current Weather

,
New York, NY
,
78°
]; } function Weather(weather) { return [React.createElement( "h2", null, "Current Weather" ), React.createElement( "address", null, "New York, NY" ), React.createElement( "div", null, React.createElement( "strong", null, "78\xB0" ) )]; }

Slide 16

Slide 16 text

https://medium.com/reloading/javascript-start-up-performance-69200f43b201

Slide 17

Slide 17 text

Current Weather

New York, NY
{{weather.temperature}}°

Slide 18

Slide 18 text

COMPILER

Slide 19

Slide 19 text

COMPILER

Current Weather

New York, NY
{{weather.temperature}}°
{{@title}}

Slide 20

Slide 20 text

COMPILER

Slide 21

Slide 21 text

COMPILER

Slide 22

Slide 22 text

COMPILER ?

Slide 23

Slide 23 text

COMPILER 101010 010101 101010

Slide 24

Slide 24 text

BYTECODE

Slide 25

Slide 25 text

0x19 0x00 0x1f 0x16 0x01 0x20 0x16 0x02 0x19 0x03 0x1f 0x16 0x04 0x20 0x16 0x02 0x19 0x05 0x1f 0x16 0x06 0x19 0x07 0x1f 0x16 0x08 0x30 0x15 0x48 0x04 0x00 0x05 0x09 0x05 0x0a 0x0d 0x03 0x00 0x39 0x32 0x02 0x2f 0x36 0x3c 0x00 0x13 0x04 0x0d 0x03 0x01 0x0f 0x04 0x30 0x0b 0x13 0x28 0x0b 0x13 0x0b 0x13 0x28 0x0b 0x13 0x0b 0x13 0x28 0x0b 0x13 0x3d 0x00 0x07 0x3f 0x3f 0x04 0x47 0x25 0x40 0x00 0x04 0x41 0x04 0x4a 0x04 0x45 0x04 0x46 0x4a 0x04 0x31 0x13 0x26 0x48 0x0f 0x04 0x33 0x14 0x18 0x00 0x33 0x14 0x31 0x16 0x0b 0x20 0x16 0x0c 0x20 0x14

Current Weather

New York, NY
{{weather.temperature}}°

Slide 26

Slide 26 text

0x28 PushBlockScope 0x0b Primitive primitive: 0x13 19 0x0b Primitive primitive: 0x13 19 0x28 PushBlockScope 0x0b Primitive primitive: 0x13 19 0x0b Primitive primitive: 0x13 19 0x28 PushBlockScope 0x0b Primitive primitive: 0x13 19 0x3d PushArgs names: 0x00 0 positionals: 0x07 7 synthetic: 0x3f 319 0x3f PrepareArgs state: 0x04 4 0x47 BeginComponentTransaction 0x25 PushDynamicScope 0x40 CreateComponent flags: 0x00 0 state: 0x04 4 0x41 RegisterComponentDestructor state: 0x04 4 0x43 GetComponentSelf state: 0x04 4 0x45 GetComponentLayout state: 0x04 4 0x46 InvokeComponentLayout 0x4a DidRenderLayout state: 0x04 4 0x31 PopFrame 0x13 PopScope 0x26 PopDynamicScope 0x48 CommitComponentTransaction 0x0f Load register: 0x04 4 0x33 Exit 0x14 Return 0x18 DynamicContent trusting: 0x00 0 0x33 Exit 0x14 Return 0x31 PopFrame 0x16 Text text: 0x0b "°\n " 0x20 CloseElement 0x16 Text text: 0x0c "\n" 0x20 CloseElement 0x14 Return 0x19 OpenElement tag: 0x00 "h2" 0x1f FlushElement 0x16 Text text: 0x01 "Current Weather" 0x20 CloseElement 0x16 Text text: 0x02 "\n\n" 0x19 OpenElement tag: 0x03 "address" 0x1f FlushElement 0x16 Text text: 0x04 "\n New York, NY\n" 0x20 CloseElement 0x16 Text text: 0x02 "\n\n" 0x19 OpenElement tag: 0x05 "div" 0x1f FlushElement 0x16 Text text: 0x06 "\n " 0x19 OpenElement tag: 0x07 "strong" 0x1f FlushElement 0x16 Text text: 0x08 "\n " 0x30 PushFrame 0x15 ReturnTo offset: 0x48 72 0x04 GetVariable symbol: 0x00 0 0x05 GetProperty key: 0x09 "weather" 0x05 GetProperty key: 0x0a "temperature" 0x0d Dup register: 0x03 3 offset: 0x00 0 0x39 IsComponent 0x32 Enter args: 0x02 2 0x2f JumpUnless to: 0x36 54 0x3c PushDynamicComponentManager meta: 0x00 0 0x10 Fetch register: 0x04 4 0x0d Dup register: 0x03 3 offset: 0x01 1 0x0f Load register: 0x04 4 0x30 PushFrame 0x0b Primitive primitive: 0x13 19

Slide 27

Slide 27 text

0x28 PushBlockScope 0x0b Primitive primitive: 0x13 19 0x0b Primitive primitive: 0x13 19 0x28 PushBlockScope 0x0b Primitive primitive: 0x13 19 0x0b Primitive primitive: 0x13 19 0x28 PushBlockScope 0x0b Primitive primitive: 0x13 19 0x3d PushArgs names: 0x00 0 positionals: 0x07 7 synthetic: 0x3f 319 0x3f PrepareArgs state: 0x04 4 0x47 BeginComponentTransaction 0x25 PushDynamicScope 0x40 CreateComponent flags: 0x00 0 state: 0x04 4 0x41 RegisterComponentDestructor state: 0x04 4 0x43 GetComponentSelf state: 0x04 4 0x45 GetComponentLayout state: 0x04 4 0x46 InvokeComponentLayout 0x4a DidRenderLayout state: 0x04 4 0x31 PopFrame 0x13 PopScope 0x26 PopDynamicScope 0x48 CommitComponentTransaction 0x0f Load register: 0x04 4 0x33 Exit 0x14 Return 0x18 DynamicContent trusting: 0x00 0 0x33 Exit 0x14 Return 0x31 PopFrame 0x16 Text text: 0x0b "°\n " 0x20 CloseElement 0x16 Text text: 0x0c "\n" 0x20 CloseElement 0x14 Return 0x19 OpenElement tag: 0x00 "h2" 0x1f FlushElement 0x16 Text text: 0x01 "Current Weather" 0x20 CloseElement 0x16 Text text: 0x02 "\n\n" 0x19 OpenElement tag: 0x03 "address" 0x1f FlushElement 0x16 Text text: 0x04 "\n New York, NY\n" 0x20 CloseElement 0x16 Text text: 0x02 "\n\n" 0x19 OpenElement tag: 0x05 "div" 0x1f FlushElement 0x16 Text text: 0x06 "\n " 0x19 OpenElement

Slide 28

Slide 28 text

COMPILER VM 101010 010101 101010 BUILD TIME BROWSER

Slide 29

Slide 29 text

COMPILER VM 101010 010101 101010 BUILD TIME BROWSER

Slide 30

Slide 30 text

Current Weather

New York, NY
78°
{strings:["h2","Current Weather","\n\n","address","\n New York, NY\n","div","\n ","strong","\n 78°\n ","\n"]} 19 01 00 00 1F 00 16 01 01 00 20 00 16 01 02 00 19 01 03 00 1F 00 16 01 04 00 20 00 16 01 02 00 19 01 05 00 1F 00 16 01 06 00 19 01 07 00 1F 00 16 01 08 00 20 00 16 01 09 00 20 00 14 00

Slide 31

Slide 31 text

https://medium.com/@samccone/performance-futures-bundling-281543d9a0d5 DOWNLOAD PARSE COMPILE EXECUTE 130MS 200MS

Slide 32

Slide 32 text

No content

Slide 33

Slide 33 text

DOWNLOAD EXECUTE 130MS PARSE COMPILE 200MS

Slide 34

Slide 34 text

DOWNLOAD EXECUTE 130MS

Slide 35

Slide 35 text

DOWNLOAD EXECUTE 130MS

Slide 36

Slide 36 text

export class Heap { private heap: Uint16Array | Array; private table: number[]; private offset = 0; private handle = 0; constructor(serializedHeap?: { buffer: ArrayBuffer, table: number[], handle: number }) { if (serializedHeap) { let { buffer, table, handle } = serializedHeap; this.heap = new Uint16Array(buffer); this.table = table; this.offset = this.heap.length; this.handle = handle; } else { this.heap = new Uint16Array(0x100000); this.table = []; } } push(item: number): void { this.heap[this.offset++] = item; } getbyaddr(address: number): number { return this.heap[address]; Glimmer VM uses ArrayBuffer directly, no parse or intermediate data structure.

Slide 37

Slide 37 text

Demo

Slide 38

Slide 38 text

No content

Slide 39

Slide 39 text

No content

Slide 40

Slide 40 text

๏ Tiny runtime ๏ Compact bytecode ๏ No parse is faster than no parse 1 Instant Templates

Slide 41

Slide 41 text

1 3 2 Instant Templates 60fps Incremental Rendering Optimized Updates

Slide 42

Slide 42 text

2 Optimized Updates

Slide 43

Slide 43 text

Lightweight ๏ Downloads fast. ๏ Parses fast. ๏ Renders fast. Responsive ๏ Tap or click → updates fast. ๏ Sophisticated animations. ๏ 60fps scrolling.

Slide 44

Slide 44 text

No content

Slide 45

Slide 45 text

“What makes a React app slow is, most of the time, useless rerenders of many components. You may have read that the React VirtualDom is super fast. That's true, but in a medium size app, a full redraw can easily render hundreds of components. Even the fastest VirtualDom templating engine can't make that in less than 16ms.”

Slide 46

Slide 46 text

“The React documentation is very clear about the way to avoid useless rerenders: shouldComponentUpdate(). … it's your job as a developer to check that the props of a component didn't change and skip rendering altogether in that case.”

Slide 47

Slide 47 text

GLIMMER VM

Slide 48

Slide 48 text

APPENDING VM UPDATING VM

Slide 49

Slide 49 text

{{firstName}}

Slide 50

Slide 50 text

{{firstName}}
STATIC DYNAMIC

Slide 51

Slide 51 text

0x0019 OpenElement tag: 0x0000 "div" 0x001c StaticAttr name: 0x0001 "class" value: 0x0002 "active" namespace: 0x0000 0 0x001f FlushElement 0x0004 GetVariable symbol: 0x0000 0 0x0005 GetProperty key: 0x0003 "firstName" 0x0018 DynamicContent trusting: 0x0000 0 0x0020 CloseElement 0x0014 Return
{{firstName}}

Slide 52

Slide 52 text

StaticAttr OpenElement GetVariable GetProperty DynamicContent CloseElement APPEND PROGRAM DOM

Slide 53

Slide 53 text

StaticAttr OpenElement GetVariable GetProperty DynamicContent CloseElement APPEND PROGRAM DOM

Slide 54

Slide 54 text

StaticAttr OpenElement GetVariable GetProperty DynamicContent CloseElement APPEND PROGRAM

Slide 55

Slide 55 text

StaticAttr OpenElement GetVariable GetProperty DynamicContent CloseElement APPEND PROGRAM

Slide 56

Slide 56 text

StaticAttr OpenElement GetVariable GetProperty DynamicContent CloseElement APPEND PROGRAM
DOM

Slide 57

Slide 57 text

StaticAttr OpenElement GetVariable GetProperty DynamicContent CloseElement APPEND PROGRAM
DOM

Slide 58

Slide 58 text

StaticAttr OpenElement GetVariable GetProperty DynamicContent CloseElement APPEND PROGRAM
DOM

Slide 59

Slide 59 text

StaticAttr OpenElement GetVariable GetProperty DynamicContent CloseElement APPEND PROGRAM
DOM

Slide 60

Slide 60 text

StaticAttr OpenElement GetVariable GetProperty DynamicContent CloseElement APPEND PROGRAM
Sean DOM

Slide 61

Slide 61 text

StaticAttr OpenElement GetVariable GetProperty DynamicContent CloseElement APPEND PROGRAM UPDATE PROGRAM
Sean DOM

Slide 62

Slide 62 text

StaticAttr OpenElement GetVariable GetProperty DynamicContent CloseElement APPEND PROGRAM UPDATE PROGRAM UpdateDynamicContent
Sean DOM

Slide 63

Slide 63 text

StaticAttr OpenElement GetVariable GetProperty DynamicContent CloseElement APPEND PROGRAM UPDATE PROGRAM UpdateDynamicContent
Sean DOM

Slide 64

Slide 64 text

StaticAttr OpenElement GetVariable GetProperty DynamicContent CloseElement APPEND PROGRAM UPDATE PROGRAM UpdateDynamicContent
Sean
DOM

Slide 65

Slide 65 text

StaticAttr OpenElement GetVariable GetProperty DynamicContent CloseElement APPEND PROGRAM UPDATE PROGRAM UpdateDynamicContent
Sean
DOM

Slide 66

Slide 66 text

StaticAttr OpenElement GetVariable GetProperty DynamicContent CloseElement APPEND PROGRAM UPDATE PROGRAM UpdateDynamicContent
Sean
DOM

Slide 67

Slide 67 text

StaticAttr OpenElement GetVariable GetProperty DynamicContent CloseElement APPEND PROGRAM UPDATE PROGRAM UpdateDynamicContent
DOM Brendan

Slide 68

Slide 68 text

StaticAttr OpenElement GetVariable GetProperty DynamicContent CloseElement APPEND PROGRAM UPDATE PROGRAM UpdateDynamicContent

Slide 69

Slide 69 text

StaticAttr OpenElement GetVariable GetProperty DynamicContent CloseElement APPEND PROGRAM UPDATE PROGRAM UpdateDynamicContent 6× LESS WORK

Slide 70

Slide 70 text

Demo

Slide 71

Slide 71 text

import RudyRufer from './RudyRufer'; import TheSunHasGotHisHatOn from './ TheSunHasGotHisHatOn'; import Roenno from './Roenno'; import LisaSchulte from './LisaSchulte'; import ChasinWildTrains from './ChasinWildTrains'; import TommyWinship from './TommyWinship'; import Parepepeotes from './Parepepeotes'; export default class extends React.Component { componentDidMount() { let counter = 0; setInterval(() => { this.setState({ counter: ++counter }); }, 0); } render() { let { state } = this; let { counter } = state || {}; return

{ counter }

import RudyRufer from './RudyRufer'; import TheSunHasGotHisHatOn from './ TheSunHasGotHisHatOn'; import Roenno from './Roenno'; import LisaSchulte from './LisaSchulte'; import ChasinWildTrains from './ChasinWildTrains'; import TommyWinship from './TommyWinship'; import Parepepeotes from './Parepepeotes'; export default class extends Component { @tracked counter = 0; didInsertElement() { setInterval(() => { this.counter++; }, 0); } static template = `

{{counter}}

REACT GLIMMER

Slide 72

Slide 72 text

import RudyRufer from './RudyRufer'; import TheSunHasGotHisHatOn from './ TheSunHasGotHisHatOn'; import Roenno from './Roenno'; import LisaSchulte from './LisaSchulte'; import ChasinWildTrains from './ChasinWildTrains'; import TommyWinship from './TommyWinship'; import Parepepeotes from './Parepepeotes'; export default class extends React.Component { componentDidMount() { let counter = 0; setInterval(() => { this.setState({ counter: ++counter }); }, 0); } render() { let { state } = this; let { counter } = state || {}; return

{ counter }

import RudyRufer from './RudyRufer'; import TheSunHasGotHisHatOn from './ TheSunHasGotHisHatOn'; import Roenno from './Roenno'; import LisaSchulte from './LisaSchulte'; import ChasinWildTrains from './ChasinWildTrains'; import TommyWinship from './TommyWinship'; import Parepepeotes from './Parepepeotes'; export default class extends Component { @tracked counter = 0; didInsertElement() { setInterval(() => { this.counter++; }, 0); } static template = `

{{counter}}

REACT GLIMMER

Slide 73

Slide 73 text

import RudyRufer from './RudyRufer'; import TheSunHasGotHisHatOn from './ TheSunHasGotHisHatOn'; import Roenno from './Roenno'; import LisaSchulte from './LisaSchulte'; import ChasinWildTrains from './ChasinWildTrains'; import TommyWinship from './TommyWinship'; import Parepepeotes from './Parepepeotes'; export default class extends React.Component { componentDidMount() { let counter = 0; setInterval(() => { this.setState({ counter: ++counter }); }, 0); } render() { let { state } = this; let { counter } = state || {}; return

{ counter }

import RudyRufer from './RudyRufer'; import TheSunHasGotHisHatOn from './ TheSunHasGotHisHatOn'; import Roenno from './Roenno'; import LisaSchulte from './LisaSchulte'; import ChasinWildTrains from './ChasinWildTrains'; import TommyWinship from './TommyWinship'; import Parepepeotes from './Parepepeotes'; export default class extends Component { @tracked counter = 0; didInsertElement() { setInterval(() => { this.counter++; }, 0); } static template = `

{{counter}}

REACT GLIMMER

Slide 74

Slide 74 text

import RudyRufer from './RudyRufer'; import TheSunHasGotHisHatOn from './ TheSunHasGotHisHatOn'; import Roenno from './Roenno'; import LisaSchulte from './LisaSchulte'; import ChasinWildTrains from './ChasinWildTrains'; import TommyWinship from './TommyWinship'; import Parepepeotes from './Parepepeotes'; export default class extends React.Component { componentDidMount() { let counter = 0; setInterval(() => { this.setState({ counter: ++counter }); }, 0); } render() { let { state } = this; let { counter } = state || {}; return

{ counter }

import RudyRufer from './RudyRufer'; import TheSunHasGotHisHatOn from './ TheSunHasGotHisHatOn'; import Roenno from './Roenno'; import LisaSchulte from './LisaSchulte'; import ChasinWildTrains from './ChasinWildTrains'; import TommyWinship from './TommyWinship'; import Parepepeotes from './Parepepeotes'; export default class extends Component { @tracked counter = 0; didInsertElement() { setInterval(() => { this.counter++; }, 0); } static template = `

{{counter}}

REACT GLIMMER

Slide 75

Slide 75 text

No content

Slide 76

Slide 76 text

No content

Slide 77

Slide 77 text

2 Optimized Updates • With Virtual DOM, sluggish update performance can sneak up on you • Generating optimized bytecode during initial render keeps updates fast

Slide 78

Slide 78 text

1 3 2 Instant Templates 60fps Incremental Rendering Optimized Updates

Slide 79

Slide 79 text

3 60fps Incremental Rendering

Slide 80

Slide 80 text

e Frame Frame Frame Frame F

Slide 81

Slide 81 text

s 16ms 16ms 16ms 16ms 1

Slide 82

Slide 82 text

s 16ms 16ms 16ms 16ms 1 1000ms ÷ 60 = 16.6 ̅ms

Slide 83

Slide 83 text

s 70ms 1

Slide 84

Slide 84 text

s 70ms 1

Slide 85

Slide 85 text

1000ms+

Slide 86

Slide 86 text

1000ms+ WHITE RECTANGLE OF DOOM

Slide 87

Slide 87 text

OpenElement FlushElement Text CloseElement GetVariable GetProperty DynamicContent SYNCHRONOUS

Slide 88

Slide 88 text

OpenElement FlushElement requestIdleCallback 16ms Text CloseElement GetVariable requestIdleCallback 16ms GetProperty DynamicContent requestIdleCallback 16ms

Slide 89

Slide 89 text

OpenElement FlushElement requestIdleCallback 16ms Text CloseElement GetVariable requestIdleCallback 16ms GetProperty DynamicContent requestIdleCallback 16ms

Slide 90

Slide 90 text

Demo

Slide 91

Slide 91 text

No content

Slide 92

Slide 92 text

No content

Slide 93

Slide 93 text

render(iterator: TemplateIterator): void { // Iterate the template iterator, executing the compiled template program // until there are no more instructions left to execute. let result; do { result = iterator.next(); } while (!result.done); this.result = result.value; }

Slide 94

Slide 94 text

render(iterator: TemplateIterator): Promise { return new Promise((resolve) => { let timeout = this.timeout; let tick = (deadline: Deadline) => { let iteratorResult: IteratorResult; do { iteratorResult = iterator.next(); } while (!iteratorResult.done && deadline.timeRemaining() > 1); if (iteratorResult.done) { this.result = iteratorResult.value; return resolve(); } requestIdleCallback(tick, { timeout }); }; requestIdleCallback(tick, { timeout }); }); }

Slide 95

Slide 95 text

No content

Slide 96

Slide 96 text

No content

Slide 97

Slide 97 text

• Initial render can take multiple seconds on low-end phones • Raw optimization has reached diminishing returns—we need to break up the work. • VM architecture make this almost too easy. • Works with rehydration, too! 2 60fps Incremental Rendering

Slide 98

Slide 98 text

1 3 2 Instant Templates 60fps Incremental Rendering Optimized Updates

Slide 99

Slide 99 text

Future ๏ Implement VM in Web Assembly ๏ Execute programs in Web Worker

Slide 100

Slide 100 text

https://try.glimmerjs.com

Slide 101

Slide 101 text

https://try.glimmerjs.com

Slide 102

Slide 102 text

No content

Slide 103

Slide 103 text

Thank you! @tomdale