diff --git a/packages/react-devtools-shared/src/backend/fiber/renderer.js b/packages/react-devtools-shared/src/backend/fiber/renderer.js
index fc054d817d46b..a49cf25a1d1f4 100644
--- a/packages/react-devtools-shared/src/backend/fiber/renderer.js
+++ b/packages/react-devtools-shared/src/backend/fiber/renderer.js
@@ -3343,6 +3343,7 @@ export function attach(
     }
     let start = -1;
     let end = -1;
+    let byteSize = 0;
     // $FlowFixMe[method-unbinding]
     if (typeof performance.getEntriesByType === 'function') {
       // We may be able to collect the start and end time of this resource from Performance Observer.
@@ -3352,6 +3353,8 @@ export function attach(
         if (resourceEntry.name === href) {
           start = resourceEntry.startTime;
           end = start + resourceEntry.duration;
+          // $FlowFixMe[prop-missing]
+          byteSize = (resourceEntry.transferSize: any) || 0;
         }
       }
     }
@@ -3367,6 +3370,10 @@ export function attach(
       // $FlowFixMe: This field doesn't usually take a Fiber but we're only using inside this file.
       owner: fiber, // Allow linking to the <link> if it's not filtered.
     };
+    if (byteSize > 0) {
+      // $FlowFixMe[cannot-write]
+      ioInfo.byteSize = byteSize;
+    }
     const asyncInfo: ReactAsyncInfo = {
       awaited: ioInfo,
       // $FlowFixMe: This field doesn't usually take a Fiber but we're only using inside this file.
@@ -3431,6 +3438,7 @@ export function attach(
     }
     let start = -1;
     let end = -1;
+    let byteSize = 0;
     let fileSize = 0;
     // $FlowFixMe[method-unbinding]
     if (typeof performance.getEntriesByType === 'function') {
@@ -3442,7 +3450,9 @@ export function attach(
           start = resourceEntry.startTime;
           end = start + resourceEntry.duration;
           // $FlowFixMe[prop-missing]
-          fileSize = (resourceEntry.encodedBodySize: any) || 0;
+          fileSize = (resourceEntry.decodedBodySize: any) || 0;
+          // $FlowFixMe[prop-missing]
+          byteSize = (resourceEntry.transferSize: any) || 0;
         }
       }
     }
@@ -3476,6 +3486,10 @@ export function attach(
       // $FlowFixMe: This field doesn't usually take a Fiber but we're only using inside this file.
       owner: fiber, // Allow linking to the <link> if it's not filtered.
     };
+    if (byteSize > 0) {
+      // $FlowFixMe[cannot-write]
+      ioInfo.byteSize = byteSize;
+    }
     const asyncInfo: ReactAsyncInfo = {
       awaited: ioInfo,
       // $FlowFixMe: This field doesn't usually take a Fiber but we're only using inside this file.
@@ -4704,16 +4718,15 @@ export function attach(
       trackDebugInfoFromLazyType(nextFiber);
       trackDebugInfoFromUsedThenables(nextFiber);
 
-      if (
-        nextFiber.tag === HostHoistable &&
-        prevFiber.memoizedState !== nextFiber.memoizedState
-      ) {
+      if (nextFiber.tag === HostHoistable) {
         const nearestInstance = reconcilingParent;
         if (nearestInstance === null) {
           throw new Error('Did not expect a host hoistable to be the root');
         }
-        releaseHostResource(nearestInstance, prevFiber.memoizedState);
-        aquireHostResource(nearestInstance, nextFiber.memoizedState);
+        if (prevFiber.memoizedState !== nextFiber.memoizedState) {
+          releaseHostResource(nearestInstance, prevFiber.memoizedState);
+          aquireHostResource(nearestInstance, nextFiber.memoizedState);
+        }
         trackDebugInfoFromHostResource(nearestInstance, nextFiber);
       } else if (
         nextFiber.tag === HostComponent ||
@@ -5948,6 +5961,7 @@ export function attach(
         description: getIODescription(resolvedValue),
         start: ioInfo.start,
         end: ioInfo.end,
+        byteSize: ioInfo.byteSize == null ? null : ioInfo.byteSize,
         value: ioInfo.value == null ? null : ioInfo.value,
         env: ioInfo.env == null ? null : ioInfo.env,
         owner:
diff --git a/packages/react-devtools-shared/src/backend/types.js b/packages/react-devtools-shared/src/backend/types.js
index ffbacea01aaba..12b082aeb2e55 100644
--- a/packages/react-devtools-shared/src/backend/types.js
+++ b/packages/react-devtools-shared/src/backend/types.js
@@ -239,6 +239,7 @@ export type SerializedIOInfo = {
   description: string,
   start: number,
   end: number,
+  byteSize: null | number,
   value: null | Promise<mixed>,
   env: null | string,
   owner: null | SerializedElement,
diff --git a/packages/react-devtools-shared/src/backendAPI.js b/packages/react-devtools-shared/src/backendAPI.js
index f8fa4da372549..f6c11fb10d66a 100644
--- a/packages/react-devtools-shared/src/backendAPI.js
+++ b/packages/react-devtools-shared/src/backendAPI.js
@@ -221,6 +221,7 @@ function backendToFrontendSerializedAsyncInfo(
       description: ioInfo.description,
       start: ioInfo.start,
       end: ioInfo.end,
+      byteSize: ioInfo.byteSize,
       value: ioInfo.value,
       env: ioInfo.env,
       owner:
diff --git a/packages/react-devtools-shared/src/devtools/views/Components/InspectedElementSuspendedBy.js b/packages/react-devtools-shared/src/devtools/views/Components/InspectedElementSuspendedBy.js
index 451b53b4ac597..95c4fe817d528 100644
--- a/packages/react-devtools-shared/src/devtools/views/Components/InspectedElementSuspendedBy.js
+++ b/packages/react-devtools-shared/src/devtools/views/Components/InspectedElementSuspendedBy.js
@@ -76,6 +76,19 @@ function getShortDescription(name: string, description: string): string {
   return '';
 }
 
+function formatBytes(bytes: number) {
+  if (bytes < 1_000) {
+    return bytes + ' bytes';
+  }
+  if (bytes < 1_000_000) {
+    return (bytes / 1_000).toFixed(1) + ' kB';
+  }
+  if (bytes < 1_000_000_000) {
+    return (bytes / 1_000_000).toFixed(1) + ' mB';
+  }
+  return (bytes / 1_000_000_000).toFixed(1) + ' gB';
+}
+
 function SuspendedByRow({
   bridge,
   element,
@@ -145,7 +158,13 @@ function SuspendedByRow({
       <Button
         className={styles.CollapsableHeader}
         onClick={() => setIsOpen(prevIsOpen => !prevIsOpen)}
-        title={longName + ' — ' + (end - start).toFixed(2) + ' ms'}>
+        title={
+          longName +
+          ' — ' +
+          (end - start).toFixed(2) +
+          ' ms' +
+          (ioInfo.byteSize != null ? ' — ' + formatBytes(ioInfo.byteSize) : '')
+        }>
         <ButtonIcon
           className={styles.CollapsableHeaderIcon}
           type={isOpen ? 'expanded' : 'collapsed'}
diff --git a/packages/react-devtools-shared/src/frontend/types.js b/packages/react-devtools-shared/src/frontend/types.js
index 4aa936ab6481c..8e6a3394f911a 100644
--- a/packages/react-devtools-shared/src/frontend/types.js
+++ b/packages/react-devtools-shared/src/frontend/types.js
@@ -207,6 +207,7 @@ export type SerializedIOInfo = {
   description: string,
   start: number,
   end: number,
+  byteSize: null | number,
   value: null | Promise<mixed>,
   env: null | string,
   owner: null | SerializedElement,
diff --git a/packages/shared/ReactTypes.js b/packages/shared/ReactTypes.js
index ff2649a23dc0d..f2228233259cd 100644
--- a/packages/shared/ReactTypes.js
+++ b/packages/shared/ReactTypes.js
@@ -237,6 +237,7 @@ export type ReactIOInfo = {
   +name: string, // the name of the async function being called (e.g. "fetch")
   +start: number, // the start time
   +end: number, // the end time (this might be different from the time the await was unblocked)
+  +byteSize?: number, // the byte size of this resource across the network. (should only be included if affecting the client.)
   +value?: null | Promise<mixed>, // the Promise that was awaited if any, may be rejected
   +env?: string, // the environment where this I/O was spawned.
   +owner?: null | ReactComponentInfo,