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diff --git a/dom/canvas/test/webgl-conf/checkout/conformance2/rendering/texture-switch-performance.html b/dom/canvas/test/webgl-conf/checkout/conformance2/rendering/texture-switch-performance.html
new file mode 100644
index 0000000000..da7a9e2f57
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+++ b/dom/canvas/test/webgl-conf/checkout/conformance2/rendering/texture-switch-performance.html
@@ -0,0 +1,101 @@
+<!--
+Copyright (c) 2019 The Khronos Group Inc.
+Use of this source code is governed by an MIT-style license that can be
+found in the LICENSE.txt file.
+-->
+
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>WebGL 2 Texture Switch Conformance Tests</title>
+<link rel="stylesheet" href="../../resources/js-test-style.css"/>
+<script src="../../js/js-test-pre.js"></script>
+<script src="../../js/webgl-test-utils.js"></script>
+</head>
+<body>
+<div id="description"></div>
+<div id="console"></div>
+<script>
+"use strict";
+description("Ensures that switching the texture referenced by a sampler uniform performs reasonably well.");
+var wtu = WebGLTestUtils;
+var canvas = document.createElement('canvas');
+canvas.width = 32;
+canvas.height = 32;
+var gl = wtu.create3DContext(canvas, undefined, 2);
+if (!gl) {
+  testFailed("context does not exist");
+  finishTest();
+} else {
+  var program = wtu.setupTexturedQuad(gl);
+  var tex = gl.createTexture();
+  gl.activeTexture(gl.TEXTURE0);
+  gl.bindTexture(gl.TEXTURE_2D, tex);
+  gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
+
+  var tex2 = gl.createTexture();
+  gl.activeTexture(gl.TEXTURE1);
+  gl.bindTexture(gl.TEXTURE_2D, tex);
+  gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
+
+  var loc = gl.getUniformLocation(program, "tex");
+
+  var RUNTIME = 2000;
+  var THRESHOLD = 0.8;
+  var baseStartTime = 0;
+  var baseFrameCount = 0;
+  var testStartTime = 0;
+  var testFrameCount = 0;
+
+  baseStartTime = Date.now();
+  function drawBaseline() {
+    for (var i = 0; i < 400; ++i) {
+      gl.uniform1i(loc, 0);
+      gl.drawArrays(gl.TRIANGLES, 0, 6);
+      gl.uniform1i(loc, 0);
+      gl.drawArrays(gl.TRIANGLES, 0, 6);
+    }
+
+    ++baseFrameCount;
+
+    if (Date.now() - baseStartTime > RUNTIME) {
+      testStartTime = Date.now();
+      requestAnimationFrame(drawTest);
+    } else {
+      requestAnimationFrame(drawBaseline);
+    }
+  }
+
+  function drawTest() {
+    for (var i = 0; i < 400; ++i) {
+      gl.uniform1i(loc, 0);
+      gl.drawArrays(gl.TRIANGLES, 0, 6);
+      gl.uniform1i(loc, 1);
+      gl.drawArrays(gl.TRIANGLES, 0, 6);
+    }
+
+    ++testFrameCount;
+
+    if (Date.now() - testStartTime > RUNTIME) {
+      var perfString = " - achieved " + testFrameCount + " frames in " + ((Date.now() - testStartTime) / 1000.0) +
+        " seconds (" + (testFrameCount / baseFrameCount).toFixed(2) + " times baseline performance)";
+      if (testFrameCount > baseFrameCount * THRESHOLD) {
+        testPassed("Texture switching did not significantly hurt performance" + perfString);
+      } else {
+        testFailed("Texture switching significantly hurt performance" + perfString);
+      }
+      console.log(testFrameCount);
+      finishTest();
+    } else {
+      requestAnimationFrame(drawTest);
+    }
+  }
+
+  requestAnimationFrame(drawBaseline);
+}
+var successfullyParsed = true;
+</script>
+</body>
+</html>
+