diff --git a/web/src/test/manual/web/core/load-keyboard-blob.js b/web/src/test/manual/web/core/load-keyboard-blob.js
new file mode 100644
index 0000000000..527f0e7203
--- /dev/null
+++ b/web/src/test/manual/web/core/load-keyboard-blob.js
@@ -0,0 +1,9 @@
+export async function loadKeyboardBlob(uri) {
+  const response = await fetch(uri);
+  if (!response.ok) {
+    throw new Error(`HTTP ${response.status} ${response.statusText}`);
+  }
+
+  const buffer = await response.arrayBuffer();
+  return new Uint8Array(buffer);
+}
diff --git a/web/src/test/manual/web/core/paths.js b/web/src/test/manual/web/core/paths.js
new file mode 100644
index 0000000000..5b595711fa
--- /dev/null
+++ b/web/src/test/manual/web/core/paths.js
@@ -0,0 +1 @@
+export const CORE_WASM = '../../../../../build/engine/core-processor/obj/import/core';
diff --git a/web/src/test/manual/web/core/stress.html b/web/src/test/manual/web/core/stress.html
new file mode 100644
index 0000000000..fed4dfeaa0
--- /dev/null
+++ b/web/src/test/manual/web/core/stress.html
@@ -0,0 +1,65 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+  <meta charset="utf-8" />
+
+  <!-- Set the viewport width to match phone and tablet device widths -->
+  <meta name="viewport" content="width=device-width,user-scalable=no" />
+
+  <title>KeymanWeb Core Stress Test</title>
+
+  <!--
+    Import map defines where we can find KeymanWeb compiled modules; this must
+    be specified inline.
+  -->
+  <script type="importmap">
+    {
+      "imports": {
+        "keyman/": "../../../../../build/"
+      }
+    }
+  </script>
+
+  <script module="es6" type="module">
+    import { KM_Core } from 'keyman/engine/core-processor/lib/index.mjs';
+    import { CORE_WASM } from './paths.js';
+    import { loadKeyboardBlob } from './load-keyboard-blob.js';
+
+    let intervalId = null;
+
+    function stress() {
+      if (intervalId) {
+        window.clearInterval(intervalId);
+        intervalId = null;
+        console.log('Stopping stress');
+        return;
+      }
+      intervalId = window.setInterval(doStress, 10);
+    }
+
+    async function doStress() {
+      console.log('Starting to stress');
+      const km_core = await KM_Core.createCoreProcessor(CORE_WASM);
+      const blob = await loadKeyboardBlob('./test_8568_deadkeys.kmx')
+      const result = km_core.keyboard_load_from_blob('test', blob);
+      result.delete();
+    }
+
+    window.addEventListener('load', function () {
+      document.getElementById('stress').addEventListener('click', stress);
+    });
+
+  </script>
+</head>
+
+<body>
+  <h2>KeymanWeb Sample Page - Core Testing</h2>
+  <p>This page is designed to stress-test the loading a KMX keyboard from blob. It will repeatedly load a .kmx using the KM_Core loader.</p>
+  <p>Be sure to reference the developer console for additional feedback. </p>
+  <button id="stress">Stress Test</button>
+  <hr />
+  <h3><a href="../index.html">Return to testing home page</a></h3>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/web/src/test/manual/web/core/test_8568_deadkeys.kmx b/web/src/test/manual/web/core/test_8568_deadkeys.kmx
new file mode 100644
index 0000000000..88f00e8baf
Binary files /dev/null and b/web/src/test/manual/web/core/test_8568_deadkeys.kmx differ
diff --git a/web/src/test/manual/web/index.html b/web/src/test/manual/web/index.html
index 6d608b08d3..04ad2a84fc 100644
--- a/web/src/test/manual/web/index.html
+++ b/web/src/test/manual/web/index.html
@@ -45,6 +45,9 @@
   <h2><a href="./issue62/index.html">Light test for touch-based MutationObserver functionality</a></h2>
   <h2><a href="./issue63/index.html">Test/stress-test touch-based MutationObserver functionality</a></h2>
 
+  <h1>Keyman Core tests</h1>
+  <h2><a href="./core/stress.html">Stress-test kmx blob loader</a></h2>
+
   <h1>Issue Testing</h1>
   <h2><a href="./empty-row/index.html">Tests OSK handling of empty rows</a></h2>
   <h2><a href="./keyboard-errors/index.html">Tests keyboard error-handling functionality</a></h2>