性能缓慢，在反应中使用 p5

Question

I am trying to use p5 ( https://p5js.org/ ) in a react application and the performance of some sketches is really bad (same in development as after building the app). I'm using create-react-app for the project scaffold, without any changes to the build setup.

The sketches run around 50-60fps when running them directly in the browser, but when loaded into react they drops to about 1-2fps.

I am connecting the sketches with react like this:

 // React Component to interface the sketches class P5Wrapper extends React.Component { componentDidMount() { const { sketch, ...rest } = this.props; this.canvas = new p5(sketch(rest), this.wrapper); } componentWillReceiveProps(newProps) { const { sketch, ...rest } = newProps; if (this.props.sketch !== newProps.sketch) { this.canvas.remove(); this.canvas = new p5(newProps.sketch(rest), this.wrapper); } if (typeof this.canvas.onNewProps === "function") { this.canvas.onNewProps(newProps); } } componentWillUnmount() { this.canvas.remove(); } render() { return <div ref={(wrapper) => this.wrapper = wrapper} />; } } // you can watch the sketch in action here (https://p5js.org/examples/simulate-game-of-life.html) const gameOfLife = (props) => (p) => { let w; let columns; let rows; let board; let next; p.setup = () => { p.createCanvas(1024, 768); p.background(255); p.noStroke(); w = 20; columns = p.floor(p.width / w); rows = p.floor(p.height / w); board = new Array(columns); for (let i = 0; i < columns; i++) { board[i] = new Array(rows); } next = new Array(columns); for (let i = 0; i < columns; i++) { next[i] = new Array(rows); } init(); }; p.draw = () => { generate(); for (let i = 0; i < columns; i++) { for (let j = 0; j < rows; j++) { if ((board[i][j] === 1)) p.fill(0); else p.fill(255); p.rect(i * w, j * w, w - 1, w - 1); } } }; p.mousePressed = () => { init(); }; const init = () => { for (let i = 0; i < columns; i++) { for (let j = 0; j < rows; j++) { if (i === 0 || j === 0 || i === columns - 1 || j === rows - 1) board[i][j] = 0; else board[i][j] = p.floor(p.random(2)); next[i][j] = 0; } } }; const generate = () => { for (let x = 1; x < columns - 1; x++) { for (let y = 1; y < rows - 1; y++) { let neighbors = 0; for (let i = -1; i <= 1; i++) { for (let j = -1; j <= 1; j++) { neighbors += board[x + i][y + j]; } } neighbors -= board[x][y]; if ((board[x][y] === 1) && (neighbors < 2)) next[x][y] = 0; else if ((board[x][y] === 1) && (neighbors > 3)) next[x][y] = 0; else if ((board[x][y] === 0) && (neighbors === 3)) next[x][y] = 1; else next[x][y] = board[x][y]; } } const temp = board; board = next; next = temp; }; }; // render the wrapper and the sketch ReactDOM.render(<P5Wrapper sketch={gameOfLife} />, document.getElementById("root"));

 <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.6.0/p5.js"></script> <div id="root"/>

What could be causing the slowdown?

Answer 1

This seems to be caused due to low memory availability of RAM, it will runs smoothly when there sufficient memory available. But when there is less memory P5.js is running at low frame rate.

Brief explanation I believe while we run react applications with node, surely it could hold a huge amount of RAM. Especially when we run react with node using 4GB or less RAM configuration, we could end up P5.js or any graphic content running in very low Frames per seconds.

uplift the RAM or run in another machine

Low memory availability in RAM