Hey there! Let's fix that performance bottleneck in your solar system model—you don't have to give up the proportional setup just yet. Here are practical, p5.js-specific optimizations to get smooth framerates even on low-power browsers:

1. Lazy Rendering: Only Draw What's Visible #

Right now, you're rendering every single celestial body on every frame, even those way outside the user's current viewport. This is a huge waste of resources. Instead, calculate which objects are within the visible window and only render those.

Implementation: #

Add a visibility check before calling show() on each object. Adjust the buffer values (±100) to pre-render objects just before they enter the viewport for a smoother scroll experience:

function draw() {
  // ... existing code ...
  const viewTop = window.scrollY - 100;
  const viewBottom = window.scrollY + window.innerHeight + 100;
  
  stuff.forEach(thing => {
    // Assuming your objects have a `y` property defining their vertical position
    if (thing.y >= viewTop && thing.y <= viewBottom) {
      thing.show();
    }
  });
  // ... existing code ...
}

2. Shrink Your Canvas to Viewport Size #

A 13000px-tall canvas forces p5.js to maintain a massive bitmap in memory, which cripples low-power devices. Instead, use a canvas that matches the user's window size and map your solar system's coordinates to the viewport using scroll position.

Implementation: #

Update your setup() and object rendering logic:

function setup() {
  // Use window size instead of fixed 13000px height
  createCanvas(window.innerWidth, window.innerHeight);
  // ... rest of your object initialization ...
}

// In your Planet/Moon/Rings `show()` method, adjust the y-position using scrollY
class Planet {
  // ... existing properties ...
  show() {
    // Calculate where the planet should appear relative to the scroll position
    const displayY = this.y - window.scrollY;
    // Draw at displayY instead of this.y
    ellipse(mid, displayY, this.diameter/scale, this.diameter/scale);
    // ... rest of your rendering code ...
  }
}

3. Cut Unnecessary Overhead in draw() #

Your current draw() has repeated computations and debug logs that add up over time:

• Remove console.log(pointer)—debug logs are a hidden performance drain in production.
• Cache the blurb text instead of recalculating it every frame. Only update it when the user scrolls into a new section.

Implementation: #

let currentBlurb = '';
let lastSection = -1;

function draw() {
  let pointer = window.innerHeight/2 + window.scrollY;
  let currentSection = getCurrentSection(pointer);
  
  // Only update blurb if we've entered a new section
  if (currentSection !== lastSection) {
    currentBlurb = getBlurbForSection(currentSection);
    lastSection = currentSection;
  }

  // ... rest of draw() code ...
  text(Math.floor(pointer) * scale * 60 + " KM ----------- \n\n" + currentBlurb, 20, pointer - 20);
}

function getCurrentSection(pointer) {
  if (pointer <= 650) return 0;
  else if (pointer > 650 && pointer < 1600) return 1;
  else if (pointer > 1600 && pointer < 3000) return 2;
  else if (pointer > 3000 && pointer < 4800) return 3;
  else if (pointer > 4800) return 4;
}

function getBlurbForSection(section) {
  switch(section) {
    case 0:
      return 'The Inner Solar System: \n Home to your favorite elevated primates, \n the Inner Solar System harbors the \'Goldilocks Zone\',\n the area where the suns rays do not scorch the earth,\n and also still keep us from freezing. \nIt is the only area where carbon based life can flourish.';
    case 1:
      return 'The Asteroid Belts: \n Home to the dwarf planet Ceres, \nour Asteroid Belt is divided into three distinct bands. \nBetween each band, the resonant frequency of Jupiter\'s \nimmense gravity well has caused orbits to destabilize, \nit\'s victims most often falling into the sun';
    case 2:
      return 'Though only the 4 largest are represented here, \nJupiter is home to more than 70 Moons!\n These 4 were discovered by Galileo Galilei, \nthe inventor of the modern refracting telescope, in 1609.';
    case 3:
      return 'Saturn\'s rings are its most distinctive feature, \nvisible from hundreds of millions of kilometers away. \nHowever, they are less than 10 meters thick! \nIf saturn was the size of a basketball, \nits rings would be over 100 times \nthinner than a single sheet of paper!';
    case 4:
      return 'You might think there isn\'t much out this far, \nand for the most part you\'re right, but there is one major thing. \nThe Solar Wind, a constant stream of radiation and particles \nour sun is shedding, can still be felt out here. \nNASA has even designed deep space probes that utilize \nsolar sails instead of traditional engines, \nriding the wind like the seafaring explorers of history.';
  }
}

4. Pause Rendering When Idle #

Your current pause logic still runs draw() every frame (just not updating positions). Use p5.js's noLoop() and loop() to completely stop rendering when paused:

function mouseClicked() {
  if (stopper === 1) {
    stopper = 0;
    noLoop(); // Stop draw() from running
  } else {
    stopper = 1;
    loop(); // Resume draw()
  }
}

5. Optimize Ring Rendering #

Rings are likely one of the most expensive elements to render. If your Rings class uses complex shapes or repeated fills/strokes, simplify it:

• Use a single ellipse with a thick stroke instead of multiple filled shapes for rings.
• Pre-render ring graphics to a createGraphics buffer once in setup(), then draw that buffer instead of recreating the rings every frame.

Bonus: Test and Profile #

Use your browser's DevTools (Performance tab) to identify remaining bottlenecks. Look for long tasks in the timeline—these will point you to any remaining expensive operations.

With these changes, your scale model should run smoothly on all devices while keeping your proportional setup intact!

内容的提问来源于stack exchange，提问作者Chklt Labs