Run results for: Translucent RGBa vs Opaque RGBa with global alpha

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_1_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.1.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.1.1

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
Translucent RGBa	834468.2 Ops/sec
Opaque RGBa with globalAlpha	347293.3 Ops/sec

HTML Preparation code:

<canvas id="canvasOne" width="400" height="400"></canvas>
<canvas id="canvasTwo" width="400" height="400"></canvas>

Script Preparation code:

var canvasOne = document.getElementById("canvasOne");
var ctxOne = canvasOne.getContext("2d", { alpha: false });

var canvasTwo = document.getElementById("canvasTwo");
var ctxTwo = canvasTwo.getContext("2d", { alpha: false });

Tests:

Translucent RGBa
ctxOne.clearRect(0, 0, 400, 400); ctxOne.beginPath(); ctxOne.fillStyle = 'rgba(231, 76, 60, 0.5)'; ctxOne.arc(200, 200, 100, 0, Math.PI * 2, true); ctxOne.fill();
Opaque RGBa with globalAlpha
ctxTwo.clearRect(0, 0, 400, 400); ctxTwo.beginPath(); ctxTwo.fillStyle = 'rgba(231, 76, 60, 1)'; ctxTwo.globalAlpha = 0.5; ctxTwo.arc(200, 200, 100, 0, Math.PI * 2, true); ctxTwo.fill();

Run results for: Translucent RGBa vs Opaque RGBa with global alpha

Translucent RGBa

Opaque RGBa with globalAlpha