diff --git a/tfjs-core/src/engine.ts b/tfjs-core/src/engine.ts
index 07d8f56d5c6..6d6c309df1a 100644
--- a/tfjs-core/src/engine.ts
+++ b/tfjs-core/src/engine.ts
@@ -58,6 +58,8 @@ type KernelInfo = {
   totalTensorsSnapshot: number;
   inputShapes: number[][];
   outputShapes: number[][];
+  kernelTimeMs: number | {error: string} | Promise<number|{error: string}>;
+  extraInfo: string | Promise<string>;
 };
 
 export type ProfileInfo = {
@@ -625,15 +627,17 @@ export class Engine implements TensorTracker, DataMover {
     }
 
     // Stop recording to a tape when running a kernel.
+    let kernelProfile: KernelProfile;
     this.scopedRun(
         () => this.state.kernelDepth++, () => this.state.kernelDepth--, () => {
-          if (!this.ENV.getBool('DEBUG')) {
+          if (!this.ENV.getBool('DEBUG') && !this.state.profiling) {
             outputs = kernelFunc();
           } else {
-            let kernelProfile: KernelProfile;
             kernelProfile = this.profiler.profileKernel(
                 kernelName, inputs, () => kernelFunc());
-            this.profiler.logKernelProfile(kernelProfile);
+            if (this.ENV.getBool('DEBUG')) {
+              this.profiler.logKernelProfile(kernelProfile);
+            }
             outputs = kernelProfile.outputs;
           }
         });
@@ -652,7 +656,9 @@ export class Engine implements TensorTracker, DataMover {
         totalTensorsSnapshot: this.state.numTensors,
         inputShapes: Object.keys(inputs).map(
             key => inputs[key] != null ? inputs[key].shape : null),
-        outputShapes: outputs.map(item => item.shape)
+        outputShapes: outputs.map(item => item.shape),
+        kernelTimeMs: kernelProfile.timeMs,
+        extraInfo: kernelProfile.extraInfo
       });
     }
     return (Array.isArray(out) ? outputs : outputs[0]) as T;
@@ -878,6 +884,10 @@ export class Engine implements TensorTracker, DataMover {
     this.state.activeProfile.newBytes = this.state.numBytes - startBytes;
     this.state.activeProfile.newTensors =
         this.state.numTensors - startNumTensors;
+    for (const kernel of this.state.activeProfile.kernels) {
+      kernel.kernelTimeMs = await kernel.kernelTimeMs;
+      kernel.extraInfo = await kernel.extraInfo;
+    }
     return this.state.activeProfile;
   }
 
diff --git a/tfjs-core/src/engine_test.ts b/tfjs-core/src/engine_test.ts
index 937c69485d6..c35369f28fa 100644
--- a/tfjs-core/src/engine_test.ts
+++ b/tfjs-core/src/engine_test.ts
@@ -387,26 +387,40 @@ describeWithFlags('profile', ALL_ENVS, () => {
     expect(profile.peakBytes).toBe(24);
     expect(profile.newTensors).toBe(1);
     expectArraysClose(await result.data(), [1, 2, 3]);
-    expect(profile.kernels).toEqual([
-      {
-        'name': 'Square',
-        'bytesAdded': 12,
-        'totalBytesSnapshot': 24,
-        'tensorsAdded': 1,
-        'totalTensorsSnapshot': 2,
-        'inputShapes': [[3]],
-        'outputShapes': [[3]]
-      },
-      {
-        'name': 'Square',
-        'bytesAdded': 12,
-        'totalBytesSnapshot': 24,
-        'tensorsAdded': 1,
-        'totalTensorsSnapshot': 2,
-        'inputShapes': [[3]],
-        'outputShapes': [[3]]
-      }
-    ]);
+    expect(profile.kernels.length).toBe(2);
+
+    // Test the types for `kernelTimeMs` and `extraInfo` to confirm the promises
+    // are resolved.
+    expect(typeof profile.kernels[0].kernelTimeMs).toBe('number');
+    expect(typeof profile.kernels[0].extraInfo).toBe('string');
+    expect(typeof profile.kernels[1].kernelTimeMs).toBe('number');
+    expect(typeof profile.kernels[1].extraInfo).toBe('string');
+
+    // The specific values of `kernelTimeMs` and `extraInfo` are tested in the
+    // tests of Profiler.profileKernel, so their values are not tested here.
+    expect(profile.kernels[0]).toEqual({
+      'name': 'Square',
+      'bytesAdded': 12,
+      'totalBytesSnapshot': 24,
+      'tensorsAdded': 1,
+      'totalTensorsSnapshot': 2,
+      'inputShapes': [[3]],
+      'outputShapes': [[3]],
+      'kernelTimeMs': profile.kernels[0].kernelTimeMs,
+      'extraInfo': profile.kernels[0].extraInfo
+    });
+
+    expect(profile.kernels[1]).toEqual({
+      'name': 'Square',
+      'bytesAdded': 12,
+      'totalBytesSnapshot': 24,
+      'tensorsAdded': 1,
+      'totalTensorsSnapshot': 2,
+      'inputShapes': [[3]],
+      'outputShapes': [[3]],
+      'kernelTimeMs': profile.kernels[1].kernelTimeMs,
+      'extraInfo': profile.kernels[1].extraInfo
+    });
   });
 
   it('squaring without disposing', async () => {
@@ -422,15 +436,20 @@ describeWithFlags('profile', ALL_ENVS, () => {
     expect(profile.peakBytes).toBe(24);
     expect(profile.newTensors).toBe(2);
     expectArraysClose(await result.data(), [1, 4, 9]);
-    expect(profile.kernels).toEqual([{
+    expect(profile.kernels.length).toBe(1);
+    expect(typeof profile.kernels[0].kernelTimeMs).toBe('number');
+    expect(typeof profile.kernels[0].extraInfo).toBe('string');
+    expect(profile.kernels[0]).toEqual({
       'name': 'Square',
       'bytesAdded': 12,
       'totalBytesSnapshot': 24,
       'tensorsAdded': 1,
       'totalTensorsSnapshot': 2,
       'inputShapes': [[3]],
-      'outputShapes': [[3]]
-    }]);
+      'outputShapes': [[3]],
+      'kernelTimeMs': profile.kernels[0].kernelTimeMs,
+      'extraInfo': profile.kernels[0].extraInfo
+    });
   });
 
   it('squaring in async query', async () => {
@@ -448,15 +467,20 @@ describeWithFlags('profile', ALL_ENVS, () => {
     expect(profile.peakBytes).toBe(24);
     expect(profile.newTensors).toBe(1);
     expectArraysClose(await result.data(), [1, 2, 3]);
-    expect(profile.kernels).toEqual([{
+    expect(profile.kernels.length).toBe(1);
+    expect(typeof profile.kernels[0].kernelTimeMs).toBe('number');
+    expect(typeof profile.kernels[0].extraInfo).toBe('string');
+    expect(profile.kernels[0]).toEqual({
       'name': 'Square',
       'bytesAdded': 12,
       'totalBytesSnapshot': 24,
       'tensorsAdded': 1,
       'totalTensorsSnapshot': 2,
       'inputShapes': [[3]],
-      'outputShapes': [[3]]
-    }]);
+      'outputShapes': [[3]],
+      'kernelTimeMs': profile.kernels[0].kernelTimeMs,
+      'extraInfo': profile.kernels[0].extraInfo
+    });
   });
 });