diff --git a/src/backend/agent.js b/src/backend/agent.js
index 7a7c7a62bb..34a5613520 100644
--- a/src/backend/agent.js
+++ b/src/backend/agent.js
@@ -46,6 +46,9 @@ export default class Agent extends EventEmitter {
   addBridge(bridge: Bridge) {
     this._bridge = bridge;
 
+    // TODO (profiling) Component commits
+    // TODO (profiling) Interactions
+
     bridge.addListener('getCommitDetails', this.getCommitDetails);
     bridge.addListener('getProfilingStatus', this.getProfilingStatus);
     bridge.addListener('getProfilingSummary', this.getProfilingSummary);
diff --git a/src/backend/renderer.js b/src/backend/renderer.js
index a6510e1310..f58d34c6b6 100644
--- a/src/backend/renderer.js
+++ b/src/backend/renderer.js
@@ -693,30 +693,32 @@ export function attach(
   ) {
     debug('enqueueUpdateIfNecessary()', fiber);
 
-    if (isProfiling) {
-      if (haveProfilerTimesChanged(fiber.alternate, fiber)) {
-        const id = getFiberID(getPrimaryFiber(fiber));
-        const { actualDuration, treeBaseDuration } = fiber;
+    const isProfilingSupported = fiber.hasOwnProperty('treeBaseDuration');
+    if (isProfilingSupported) {
+      const id = getFiberID(getPrimaryFiber(fiber));
+      const { actualDuration, treeBaseDuration } = fiber;
 
-        const operation = new Uint32Array(3);
-        operation[0] = TREE_OPERATION_UPDATE_TREE_BASE_DURATION;
-        operation[1] = id;
-        operation[2] = treeBaseDuration;
-        addOperation(operation);
+      idToTreeBaseDurationMap.set(id, fiber.treeBaseDuration);
 
-        idToTreeBaseDurationMap.set(id, treeBaseDuration);
+      if (isProfiling) {
+        if (treeBaseDuration !== fiber.alternate.treeBaseDuration) {
+          const operation = new Uint32Array(3);
+          operation[0] = TREE_OPERATION_UPDATE_TREE_BASE_DURATION;
+          operation[1] = getFiberID(getPrimaryFiber(fiber));
+          operation[2] = treeBaseDuration;
+          addOperation(operation);
+        }
 
-        if (actualDuration > 0) {
-          // If profiling is active, store durations for elements that were rendered during the commit.
-          const metadata = ((currentCommitProfilingMetadata: any): CommitProfilingData);
-          metadata.committedFibers.push({
-            id,
-            actualDuration,
-          });
-          metadata.maxActualDuration = Math.max(
-            metadata.maxActualDuration,
-            actualDuration
-          );
+        if (haveProfilerTimesChanged(fiber.alternate, fiber)) {
+          if (actualDuration > 0) {
+            // If profiling is active, store durations for elements that were rendered during the commit.
+            const metadata = ((currentCommitProfilingMetadata: any): CommitProfilingData);
+            metadata.actualDurations.push(id, actualDuration);
+            metadata.maxActualDuration = Math.max(
+              metadata.maxActualDuration,
+              actualDuration
+            );
+          }
         }
       }
     }
@@ -880,7 +882,7 @@ export function attach(
       // If profiling is active, store commit time and duration, and the current interactions.
       // The frontend may request this information after profiling has stopped.
       currentCommitProfilingMetadata = {
-        committedFibers: [],
+        actualDurations: [],
         commitTime: performance.now() - profilingStartTime,
         interactions: Array.from(root.memoizedInteractions).map(
           (interaction: Interaction) => ({
@@ -1377,13 +1379,8 @@ export function attach(
     }
   }
 
-  type CommittedFiber = {|
-    actualDuration: number,
-    id: number,
-  |};
-
   type CommitProfilingData = {|
-    committedFibers: Array<CommittedFiber>,
+    actualDurations: Array<number>,
     commitTime: number,
     interactions: Array<Interaction>,
     maxActualDuration: number,
@@ -1410,7 +1407,7 @@ export function attach(
         return {
           commitIndex,
           interactions: commitProfilingData.interactions,
-          committedFibers: commitProfilingData.committedFibers,
+          actualDurations: commitProfilingData.actualDurations,
           rootID,
         };
       }
@@ -1419,7 +1416,7 @@ export function attach(
     return {
       commitIndex,
       interactions: [],
-      committedFibers: [],
+      actualDurations: [],
       rootID,
     };
   }
diff --git a/src/backend/types.js b/src/backend/types.js
index 64c6169a69..48da3b85f3 100644
--- a/src/backend/types.js
+++ b/src/backend/types.js
@@ -56,12 +56,9 @@ export type Interaction = {|
 |};
 
 export type CommitDetails = {|
+  actualDurations: Array<number>,
   commitIndex: number,
   interactions: Array<Interaction>,
-  committedFibers: Array<{|
-    actualDuration: number,
-    id: number,
-  |}>,
   rootID: number,
 |};
 
diff --git a/src/devtools/ProfilingCache.js b/src/devtools/ProfilingCache.js
index faf6a60b02..7c76d0421d 100644
--- a/src/devtools/ProfilingCache.js
+++ b/src/devtools/ProfilingCache.js
@@ -59,7 +59,7 @@ export default class ProfilingCache {
           if (!store.profilingOperations.has(rootID)) {
             // If no profiling data was recorded for this root, skip the round trip.
             resolve({
-              committedFibers: [],
+              actualDurations: new Map(),
               interactions: [],
             });
           } else {
@@ -139,7 +139,7 @@ export default class ProfilingCache {
 
   onCommitDetails = ({
     commitIndex,
-    committedFibers,
+    actualDurations,
     interactions,
     rootID,
   }: CommitDetailsBackend) => {
@@ -148,8 +148,13 @@ export default class ProfilingCache {
     if (resolve != null) {
       this._pendingCommitDetailsMap.delete(key);
 
+      const actualDurationsMap = new Map();
+      for (let i = 0; i < actualDurations.length; i += 2) {
+        actualDurationsMap.set(actualDurations[i], actualDurations[i + 1]);
+      }
+
       resolve({
-        committedFibers,
+        actualDurations: actualDurationsMap,
         interactions,
       });
     }
@@ -166,7 +171,7 @@ export default class ProfilingCache {
     if (resolve != null) {
       this._pendingProfileSummaryMap.delete(rootID);
       const initialTreeBaseDurationsMap = new Map();
-      for (let i = 0; i < initialTreeBaseDurations.length; i++) {
+      for (let i = 0; i < initialTreeBaseDurations.length; i += 2) {
         initialTreeBaseDurationsMap.set(
           initialTreeBaseDurations[i],
           initialTreeBaseDurations[i + 1]
diff --git a/src/devtools/store.js b/src/devtools/store.js
index 76fa683fa4..9884897acf 100644
--- a/src/devtools/store.js
+++ b/src/devtools/store.js
@@ -575,33 +575,37 @@ export default class Store extends EventEmitter {
 
   // DEBUG
   __printTree = () => {
-    console.group('__printTree()');
-    this._roots.forEach((rootID: number) => {
-      const printElement = (id: number) => {
-        const element = ((this._idToElement.get(id): any): Element);
-        console.log(
-          `${'•'.repeat(element.depth)}${element.id}:${element.displayName ||
-            ''}${element.key ? `key:"${element.key}"` : ''} (${element.weight})`
-        );
-        element.children.forEach(printElement);
-      };
-      const root = ((this._idToElement.get(rootID): any): Element);
-      console.group(`${rootID}:root (${root.weight})`);
-      root.children.forEach(printElement);
-      console.groupEnd();
-    });
-    console.group(`List of ${this.numElements} elements`);
-    for (let i = 0; i < this.numElements; i++) {
-      //if (i === 4) { debugger }
-      const element = this.getElementAtIndex(i);
-      if (element != null) {
-        console.log(
-          `${'•'.repeat(element.depth)}${i}: ${element.displayName ||
-            'Unknown'}`
-        );
+    if (__DEBUG__) {
+      console.group('__printTree()');
+      this._roots.forEach((rootID: number) => {
+        const printElement = (id: number) => {
+          const element = ((this._idToElement.get(id): any): Element);
+          console.log(
+            `${'•'.repeat(element.depth)}${element.id}:${element.displayName ||
+              ''} ${element.key ? `key:"${element.key}"` : ''} (${
+              element.weight
+            })`
+          );
+          element.children.forEach(printElement);
+        };
+        const root = ((this._idToElement.get(rootID): any): Element);
+        console.group(`${rootID}:root (${root.weight})`);
+        root.children.forEach(printElement);
+        console.groupEnd();
+      });
+      console.group(`List of ${this.numElements} elements`);
+      for (let i = 0; i < this.numElements; i++) {
+        //if (i === 4) { debugger }
+        const element = this.getElementAtIndex(i);
+        if (element != null) {
+          console.log(
+            `${'•'.repeat(element.depth)}${i}: ${element.displayName ||
+              'Unknown'}`
+          );
+        }
       }
+      console.groupEnd();
+      console.groupEnd();
     }
-    console.groupEnd();
-    console.groupEnd();
   };
 }
diff --git a/src/devtools/views/Profiler/CommitRanked.js b/src/devtools/views/Profiler/CommitRanked.js
index 8e50869a37..4e856656a4 100644
--- a/src/devtools/views/Profiler/CommitRanked.js
+++ b/src/devtools/views/Profiler/CommitRanked.js
@@ -2,10 +2,13 @@
 
 import React, { useContext } from 'react';
 import { ProfilerContext } from './ProfilerContext';
+import { calculateSelfDuration } from './utils';
 import { StoreContext } from '../context';
 
 import styles from './CommitRanked.css';
 
+import type { CommitDetails, CommitTree, Node } from './types';
+
 export default function CommitRanked(_: {||}) {
   const { rendererID, rootID, selectedCommitIndex } = useContext(
     ProfilerContext
@@ -31,5 +34,57 @@ export default function CommitRanked(_: {||}) {
     rootID: ((rootID: any): number),
   });
 
+  const chartData = generateChartData(commitTree, commitDetails);
+
   return 'Coming soon: Ranked';
 }
+
+type ChartNode = {|
+  id: number,
+  label: string,
+  name: string,
+  title: string,
+  value: number,
+|};
+
+type ChartData = {|
+  maxValue: number,
+  nodes: Array<ChartNode>,
+|};
+
+const generateChartData = (
+  commitTree: CommitTree,
+  commitDetails: CommitDetails
+): ChartData => {
+  const { nodes } = commitTree;
+
+  let maxSelfDuration = 0;
+
+  const chartNodes: Array<ChartNode> = [];
+  commitDetails.actualDurations.forEach((actualDuration, id) => {
+    const node = ((nodes.get(id): any): Node);
+
+    // Don't show the root node in this chart.
+    if (node.parentID === 0) {
+      return;
+    }
+
+    const selfDuration = calculateSelfDuration(id, commitTree, commitDetails);
+    maxSelfDuration = Math.max(maxSelfDuration, selfDuration);
+
+    const name = node.displayName || 'Unknown';
+    const label = `${name} (${selfDuration.toFixed(1)}ms)`;
+    chartNodes.push({
+      id,
+      label,
+      name,
+      title: label,
+      value: selfDuration,
+    });
+  });
+
+  return {
+    maxValue: maxSelfDuration,
+    nodes: chartNodes.sort((a, b) => b.value - a.value),
+  };
+};
diff --git a/src/devtools/views/Profiler/CommitTreeBuilder.js b/src/devtools/views/Profiler/CommitTreeBuilder.js
index af5200bc44..24b92d665a 100644
--- a/src/devtools/views/Profiler/CommitTreeBuilder.js
+++ b/src/devtools/views/Profiler/CommitTreeBuilder.js
@@ -1,6 +1,7 @@
 // @flow
 
 import {
+  __DEBUG__,
   TREE_OPERATION_ADD,
   TREE_OPERATION_REMOVE,
   TREE_OPERATION_RESET_CHILDREN,
@@ -17,6 +18,17 @@ import type {
   ProfilingSummary as ProfilingSummaryFrontend,
 } from 'src/devtools/views/Profiler/types';
 
+const debug = (methodName, ...args) => {
+  if (__DEBUG__) {
+    console.log(
+      `%cCommitTreeBuilder %c${methodName}`,
+      'color: pink; font-weight: bold;',
+      'font-weight: bold;',
+      ...args
+    );
+  }
+};
+
 const rootToCommitTreeMap: Map<number, Array<CommitTree>> = new Map();
 
 export function getCommitTree({
@@ -49,40 +61,29 @@ export function getCommitTree({
     // If this is the very first commit, start with the cached snapshot and apply the first mutation.
     // Otherwise load (or generate) the previous commit and append a mutation to it.
     if (commitIndex === 0) {
-      const initialCommitTree = {
-        nodes: new Map(),
-        rootID,
-      };
+      const nodes = new Map();
 
       // Construct the initial tree.
-      const queue: Array<number> = [rootID];
-      while (queue.length > 0) {
-        const currentID = queue.pop();
-        const currentNode = ((store.profilingSnapshot.get(
-          currentID
-        ): any): Node);
-
-        initialCommitTree.nodes.set(currentID, {
-          id: currentID,
-          children: currentNode.children,
-          displayName: currentNode.displayName,
-          key: currentNode.key,
-          parentID: 0,
-          treeBaseDuration: ((profilingSummary.initialTreeBaseDurations.get(
-            currentID
-          ): any): number),
-        });
-
-        queue.push(...currentNode.children);
-      }
+      recursivelyIniitliazeTree(
+        rootID,
+        0,
+        nodes,
+        profilingSummary.initialTreeBaseDurations,
+        store
+      );
 
       // Mutate the tree
       const commitOperations = store.profilingOperations.get(rootID);
       if (commitOperations != null && commitIndex < commitOperations.length) {
         const commitTree = updateTree(
-          initialCommitTree,
+          { nodes, rootID },
           commitOperations[commitIndex]
         );
+
+        if (__DEBUG__) {
+          __printTree(commitTree);
+        }
+
         commitTrees.push(commitTree);
         return commitTree;
       }
@@ -100,6 +101,11 @@ export function getCommitTree({
           previousCommitTree,
           commitOperations[commitIndex]
         );
+
+        if (__DEBUG__) {
+          __printTree(commitTree);
+        }
+
         commitTrees.push(commitTree);
         return commitTree;
       }
@@ -113,6 +119,35 @@ export function getCommitTree({
   };
 }
 
+function recursivelyIniitliazeTree(
+  id: number,
+  parentID: number,
+  nodes: Map<number, Node>,
+  initialTreeBaseDurations: Map<number, number>,
+  store: Store
+): void {
+  const node = ((store.profilingSnapshot.get(id): any): Node);
+
+  nodes.set(id, {
+    id,
+    children: node.children,
+    displayName: node.displayName,
+    key: node.key,
+    parentID,
+    treeBaseDuration: ((initialTreeBaseDurations.get(id): any): number),
+  });
+
+  node.children.forEach(childID =>
+    recursivelyIniitliazeTree(
+      childID,
+      id,
+      nodes,
+      initialTreeBaseDurations,
+      store
+    )
+  );
+}
+
 function updateTree(
   commitTree: CommitTree,
   operations: Uint32Array
@@ -170,6 +205,11 @@ function updateTree(
             parentNode = ((nodes.get(parentID): any): Node);
             parentNode.children = parentNode.children.concat(id);
 
+            debug(
+              'Add',
+              `fiber ${id} (${displayName || 'null'}) as child of ${parentID}`
+            );
+
             const node: Node = {
               children: [],
               displayName,
@@ -197,6 +237,8 @@ function updateTree(
         if (parentNode == null) {
           // No-op
         } else {
+          debug('Remove', `fiber ${id} from parent ${parentID}`);
+
           parentNode.children = parentNode.children.filter(
             childID => childID !== id
           );
@@ -212,8 +254,11 @@ function updateTree(
 
         i = i + 3 + numChildren;
 
+        debug('Re-order', `fiber ${id} children ${children.join(',')}`);
+
         node = ((nodes.get(id): any): Node);
         node.children = Array.from(children);
+
         break;
       case TREE_OPERATION_UPDATE_TREE_BASE_DURATION:
         id = operations[i + 1];
@@ -221,6 +266,11 @@ function updateTree(
         node = ((nodes.get(id): any): Node);
         node.treeBaseDuration = operations[i + 2];
 
+        debug(
+          'Update',
+          `fiber ${id} treeBaseDuration to ${node.treeBaseDuration}`
+        );
+
         i = i + 3;
         break;
       default:
@@ -237,3 +287,29 @@ function updateTree(
 export function invalidateCommitTrees(): void {
   rootToCommitTreeMap.clear();
 }
+
+// DEBUG
+const __printTree = (commitTree: CommitTree) => {
+  if (__DEBUG__) {
+    const { nodes, rootID } = commitTree;
+    console.group('__printTree()');
+    const queue = [rootID, 0];
+    while (queue.length > 0) {
+      const id = queue.shift();
+      const depth = queue.shift();
+
+      const node = ((nodes.get(id): any): Node);
+
+      console.log(
+        `${'•'.repeat(depth)}${node.id}:${node.displayName || ''} ${
+          node.key ? `key:"${node.key}"` : ''
+        } (${node.treeBaseDuration})`
+      );
+
+      node.children.forEach(childID => {
+        queue.push(childID, depth + 1);
+      });
+    }
+    console.groupEnd();
+  }
+};
diff --git a/src/devtools/views/Profiler/SnapshotSelector.js b/src/devtools/views/Profiler/SnapshotSelector.js
index c7293018f9..fa6469b54e 100644
--- a/src/devtools/views/Profiler/SnapshotSelector.js
+++ b/src/devtools/views/Profiler/SnapshotSelector.js
@@ -55,6 +55,8 @@ export default function SnapshotSelector(_: Props) {
     return null;
   }, [filteredCommitIndices, selectedCommitIndex]);
 
+  // TODO (profiling) This should be managed by the context controller (reducer).
+  // TODO (profiling) We should also reset the selected index to 0 between profiling sessions.
   if (selectedFilteredCommitIndex === null) {
     if (numFilteredCommits > 0) {
       setSelectedCommitIndex(0);
diff --git a/src/devtools/views/Profiler/types.js b/src/devtools/views/Profiler/types.js
index bf87074dfc..0b42424578 100644
--- a/src/devtools/views/Profiler/types.js
+++ b/src/devtools/views/Profiler/types.js
@@ -21,11 +21,8 @@ export type Interaction = {|
 |};
 
 export type CommitDetails = {|
+  actualDurations: Map<number, number>,
   interactions: Array<Interaction>,
-  committedFibers: Array<{|
-    actualDuration: number,
-    id: number,
-  |}>,
 |};
 
 export type ProfilingSummary = {|
diff --git a/src/devtools/views/Profiler/utils.js b/src/devtools/views/Profiler/utils.js
index ed9897f544..d94c2ecd4e 100644
--- a/src/devtools/views/Profiler/utils.js
+++ b/src/devtools/views/Profiler/utils.js
@@ -1,5 +1,7 @@
 // @flow
 
+import type { CommitDetails, CommitTree, Node } from './types';
+
 const commitGradient = [
   'var(--color-commit-gradient-0)',
   'var(--color-commit-gradient-1)',
@@ -13,6 +15,30 @@ const commitGradient = [
   'var(--color-commit-gradient-9)',
 ];
 
+export const calculateSelfDuration = (
+  id: number,
+  commitTree: CommitTree,
+  commitDetails: CommitDetails
+): number => {
+  const { actualDurations } = commitDetails;
+  const { nodes } = commitTree;
+
+  if (!actualDurations.has(id)) {
+    return 0;
+  }
+
+  let selfDuration = ((actualDurations.get(id): any): number);
+
+  const node = ((nodes.get(id): any): Node);
+  node.children.forEach(childID => {
+    if (actualDurations.has(childID)) {
+      selfDuration -= ((actualDurations.get(childID): any): number);
+    }
+  });
+
+  return selfDuration;
+};
+
 export const getGradientColor = (value: number) => {
   const maxIndex = commitGradient.length - 1;
   let index;