diff --git a/Libraries/WebPerformance/NativePerformance.js b/Libraries/WebPerformance/NativePerformance.js
index 369dd23f7cf..85435b47997 100644
--- a/Libraries/WebPerformance/NativePerformance.js
+++ b/Libraries/WebPerformance/NativePerformance.js
@@ -13,10 +13,10 @@ import type {TurboModule} from '../TurboModule/RCTExport';
 import * as TurboModuleRegistry from '../TurboModule/TurboModuleRegistry';
 
 export interface Spec extends TurboModule {
-  +mark?: (name: string, startTime: number, duration: number) => void;
-  +clearMarks?: (markName?: string) => void;
+  +mark: (name: string, startTime: number, duration: number) => void;
+  +clearMarks: (markName?: string) => void;
 
-  +measure?: (
+  +measure: (
     name: string,
     startTime: number,
     endTime: number,
@@ -24,7 +24,7 @@ export interface Spec extends TurboModule {
     startMark?: string,
     endMark?: string,
   ) => void;
-  +clearMeasures?: (measureName?: string) => void;
+  +clearMeasures: (measureName?: string) => void;
 }
 
 export default (TurboModuleRegistry.get<Spec>('NativePerformanceCxx'): ?Spec);
diff --git a/Libraries/WebPerformance/NativePerformanceObserver.cpp b/Libraries/WebPerformance/NativePerformanceObserver.cpp
index bd10d51ac80..84864a69de2 100644
--- a/Libraries/WebPerformance/NativePerformanceObserver.cpp
+++ b/Libraries/WebPerformance/NativePerformanceObserver.cpp
@@ -45,11 +45,6 @@ std::vector<RawPerformanceEntry> NativePerformanceObserver::popPendingEntries(
   return PerformanceEntryReporter::getInstance().popPendingEntries();
 }
 
-std::vector<RawPerformanceEntry> NativePerformanceObserver::getPendingEntries(
-    jsi::Runtime &rt) {
-  return PerformanceEntryReporter::getInstance().getPendingEntries();
-}
-
 void NativePerformanceObserver::setOnPerformanceEntryCallback(
     jsi::Runtime &rt,
     std::optional<AsyncCallback<>> callback) {
diff --git a/Libraries/WebPerformance/NativePerformanceObserver.h b/Libraries/WebPerformance/NativePerformanceObserver.h
index a0e57aaf80a..9b8b6cd591c 100644
--- a/Libraries/WebPerformance/NativePerformanceObserver.h
+++ b/Libraries/WebPerformance/NativePerformanceObserver.h
@@ -52,7 +52,6 @@ class NativePerformanceObserver
   void stopReporting(jsi::Runtime &rt, std::string entryType);
 
   std::vector<RawPerformanceEntry> popPendingEntries(jsi::Runtime &rt);
-  std::vector<RawPerformanceEntry> getPendingEntries(jsi::Runtime &rt);
 
   void setOnPerformanceEntryCallback(
       jsi::Runtime &rt,
diff --git a/Libraries/WebPerformance/NativePerformanceObserver.js b/Libraries/WebPerformance/NativePerformanceObserver.js
index 88f1e16b2ae..91bd8fc0ab5 100644
--- a/Libraries/WebPerformance/NativePerformanceObserver.js
+++ b/Libraries/WebPerformance/NativePerformanceObserver.js
@@ -34,10 +34,7 @@ export type RawPerformanceEntry = {|
 export interface Spec extends TurboModule {
   +startReporting: (entryType: string) => void;
   +stopReporting: (entryType: string) => void;
-  // TODO: This is unused and only kept for the compatibility check.
-  // Clean it up once the API is complete.
-  +getPendingEntries: () => $ReadOnlyArray<RawPerformanceEntry>;
-  +popPendingEntries?: () => $ReadOnlyArray<RawPerformanceEntry>;
+  +popPendingEntries: () => $ReadOnlyArray<RawPerformanceEntry>;
   +setOnPerformanceEntryCallback: (callback?: () => void) => void;
 }
 
diff --git a/Libraries/WebPerformance/PerformanceObserver.js b/Libraries/WebPerformance/PerformanceObserver.js
index 53046dd8603..a4238be2b51 100644
--- a/Libraries/WebPerformance/PerformanceObserver.js
+++ b/Libraries/WebPerformance/PerformanceObserver.js
@@ -137,7 +137,7 @@ const onPerformanceEntry = () => {
   if (!NativePerformanceObserver) {
     return;
   }
-  const rawEntries = NativePerformanceObserver.popPendingEntries?.() ?? [];
+  const rawEntries = NativePerformanceObserver.popPendingEntries() ?? [];
   if (rawEntries.length === 0) {
     return;
   }