Improving JavaScript performance for smooth rendering across different browsers at a high frame rate

I have a fast Fourier transform (FFT) visualization using canvas that displays data at a high speed. My goal is to enhance the code so that I can have 16 browser windows open simultaneously, each running at 60 frames per second or close to it. Currently, my setup only achieves 5 fps when all 16 windows are active on my machine.

I am wondering if there are any methods to improve the performance of my drawing code for better framerate results.

Currently, I am able to achieve 60 fps with up to four browser windows open simultaneously, but the performance significantly drops after that. My current approach involves loading files into an array buffer and manipulating the data points to draw them in real-time using drawFFT() function. Do you have any recommendations on how I can boost the fps performance when multiple browser windows are running?

javascriptperformancecanvasoptimization

Answer №1

Enhancing animation performance across multiple windows

When it comes to visual animations, requestAnimationFrame is typically the preferred method due to its synchronization with the screen refresh rate, precise timing, and energy efficiency.

However, a challenge arises when working with multiple windows. Browsers prioritize power-saving by limiting screen synchronization to the currently focused window, running at 60fps. As a result, other windows are restricted to a lower frame-rate, around 5fps.

Innovative workaround techniques

The WebAudioAPI offers a unique clock system that operates independently of the main JavaScript thread. This allows for background windows to run at 60fps, regardless of focus. By leveraging this feature, developers can achieve smoother animations across multiple windows.

Below is a simple implementation utilizing the WebAudioAPI clock:


function audioTimerLoop(callback, frequency) {
  // Implementation code here
}

var stop_anim = audioTimerLoop(yourCallback, 60); // Runs 'yourCallback' every 60ms

stop_anim(); // To stop the animation loop

By centralizing the animation process on a single master window, developers can overcome limitations imposed by browsers regarding AudioContext instances. This approach involves managing all processing within the master window, while other windows focus solely on rendering.

Exploring a live example

For those interested in exploring a demonstration of this concept, check out the Live Example (make sure to allow popups and disable any ad-blockers).

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