blendMode渲染问题p5.js

Question

我一直遇到性能问题，试图可视化一些单纯噪声。在blendMode(MULTIPLY)函数中设置setup会产生一些滞后的结果。有关完整代码，请参见this codepen。我降低了框架，但没有帮助。为什么blendMode在计算上如此繁重？ ?

function setup() {
  frameRate(30);
  createCanvas(windowWidth, windowHeight);
  xCoord = round(windowWidth / (cells - 2));
  yCoord = round(windowHeight / (cells - 2));
  blue = color("rgba(2,128,215,0.75)");
  pink = color("rgba(228,15,41,0.75)");
  yellow = color("rgba(246,232,0,0.75)");
  blendMode(MULTIPLY);
}