diff --git a/spring-webflux/src/test/java/org/springframework/web/reactive/FlushingIntegrationTests.java b/spring-webflux/src/test/java/org/springframework/web/reactive/FlushingIntegrationTests.java
index 994a3bdb8cca..0a429c67af64 100644
--- a/spring-webflux/src/test/java/org/springframework/web/reactive/FlushingIntegrationTests.java
+++ b/spring-webflux/src/test/java/org/springframework/web/reactive/FlushingIntegrationTests.java
@@ -127,7 +127,7 @@ public Mono<Void> handle(ServerHttpRequest request, ServerHttpResponse response)
 			String path = request.getURI().getPath();
 			return switch (path) {
 				case "/write-and-flush" -> response.writeAndFlushWith(
-						testInterval(Duration.ofMillis(50), 2)
+						testInterval(Duration.ofMillis(1), 2)
 								.map(longValue -> wrap("data" + longValue + "\n", response))
 								.map(Flux::just)
 								.mergeWith(Flux.never()));
diff --git a/spring-webflux/src/test/java/org/springframework/web/reactive/function/server/SseHandlerFunctionIntegrationTests.java b/spring-webflux/src/test/java/org/springframework/web/reactive/function/server/SseHandlerFunctionIntegrationTests.java
index e536249a37cd..b1a25abaacb8 100644
--- a/spring-webflux/src/test/java/org/springframework/web/reactive/function/server/SseHandlerFunctionIntegrationTests.java
+++ b/spring-webflux/src/test/java/org/springframework/web/reactive/function/server/SseHandlerFunctionIntegrationTests.java
@@ -125,7 +125,7 @@ void sseAsEvent(HttpServer httpServer) throws Exception {
 
 	private static class SseHandler {
 
-		private static final Flux<Long> INTERVAL = testInterval(Duration.ofMillis(100), 2);
+		private static final Flux<Long> INTERVAL = testInterval(Duration.ofMillis(1), 2);
 
 		Mono<ServerResponse> string(ServerRequest request) {
 			return ServerResponse.ok()
diff --git a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/JacksonStreamingIntegrationTests.java b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/JacksonStreamingIntegrationTests.java
index fdabd74097f8..8de93c7e67ed 100644
--- a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/JacksonStreamingIntegrationTests.java
+++ b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/JacksonStreamingIntegrationTests.java
@@ -109,7 +109,7 @@ static class JacksonStreamingController {
 		@GetMapping(value = "/stream",
 				produces = { APPLICATION_NDJSON_VALUE, "application/stream+x-jackson-smile" })
 		Flux<Person> person() {
-			return testInterval(Duration.ofMillis(100), 50).map(l -> new Person("foo " + l));
+			return testInterval(Duration.ofMillis(1), 50).map(l -> new Person("foo " + l));
 		}
 
 	}
diff --git a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/ProtobufIntegrationTests.java b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/ProtobufIntegrationTests.java
index ef8ed31a951e..6fd4f3767a04 100644
--- a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/ProtobufIntegrationTests.java
+++ b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/ProtobufIntegrationTests.java
@@ -168,7 +168,7 @@ Flux<Msg> messages() {
 
 		@GetMapping(value = "/message-stream", produces = "application/x-protobuf;delimited=true")
 		Flux<Msg> messageStream() {
-			return testInterval(Duration.ofMillis(50), 5).map(l ->
+			return testInterval(Duration.ofMillis(1), 5).map(l ->
 					Msg.newBuilder().setFoo("Foo").setBlah(SecondMsg.newBuilder().setBlah(l.intValue()).build()).build());
 		}
 
diff --git a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/RequestMappingIntegrationTests.java b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/RequestMappingIntegrationTests.java
index 34d8a2cd6d5e..ca52e7a255d8 100644
--- a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/RequestMappingIntegrationTests.java
+++ b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/RequestMappingIntegrationTests.java
@@ -22,6 +22,7 @@
 import java.util.function.Predicate;
 
 import org.reactivestreams.Publisher;
+import reactor.core.publisher.Mono;
 
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
@@ -34,6 +35,8 @@
 import org.springframework.http.ResponseEntity;
 import org.springframework.http.server.reactive.ServerHttpRequest;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;
 import org.springframework.web.bind.annotation.RestController;
@@ -116,6 +119,13 @@ void stream(HttpServer httpServer) throws Exception {
 		assertThat(performGet("/stream", new HttpHeaders(), int[].class).getBody()).isEqualTo(expected);
 	}
 
+	@ParameterizedHttpServerTest  // gh-33739
+	void requestBodyAndDelayedResponse(HttpServer httpServer) throws Exception {
+		startServer(httpServer);
+
+		assertThat(performPost("/post", new HttpHeaders(), "text", String.class).getBody()).isEqualTo("text");
+	}
+
 
 	@Configuration
 	@EnableWebFlux
@@ -177,8 +187,14 @@ public String uri(ServerHttpRequest request) {
 
 		@GetMapping("/stream")
 		public Publisher<Long> stream() {
-			return testInterval(Duration.ofMillis(50), 5);
+			return testInterval(Duration.ofMillis(1), 5);
 		}
+
+		@PostMapping("/post")
+		public Mono<String> postDelayedInput(@RequestBody String text) {
+			return Mono.just(text).delayElement(Duration.ofMillis(1));
+		}
+
 	}
 
 
diff --git a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/SseIntegrationTests.java b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/SseIntegrationTests.java
index 39b24fc58cdd..76dd1ecbfbf5 100644
--- a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/SseIntegrationTests.java
+++ b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/SseIntegrationTests.java
@@ -203,7 +203,7 @@ void serverDetectsClientDisconnect(HttpServer httpServer, ClientHttpConnector co
 	@RequestMapping("/sse")
 	static class SseController {
 
-		private static final Flux<Long> INTERVAL = testInterval(Duration.ofMillis(100), 50);
+		private static final Flux<Long> INTERVAL = testInterval(Duration.ofMillis(1), 50);
 
 		private final Sinks.Empty<Void> cancelSink = Sinks.empty();