diff --git a/core/src/main/scala/org/apache/spark/internal/config/package.scala b/core/src/main/scala/org/apache/spark/internal/config/package.scala
index 3ce6f29c6084..f086038d0f6c 100644
--- a/core/src/main/scala/org/apache/spark/internal/config/package.scala
+++ b/core/src/main/scala/org/apache/spark/internal/config/package.scala
@@ -2215,13 +2215,13 @@ package object config {
     ConfigBuilder("spark.speculation.multiplier")
       .version("0.6.0")
       .doubleConf
-      .createWithDefault(1.5)
+      .createWithDefault(3)
 
   private[spark] val SPECULATION_QUANTILE =
     ConfigBuilder("spark.speculation.quantile")
       .version("0.6.0")
       .doubleConf
-      .createWithDefault(0.75)
+      .createWithDefault(0.9)
 
   private[spark] val SPECULATION_MIN_THRESHOLD =
     ConfigBuilder("spark.speculation.minTaskRuntime")
diff --git a/core/src/test/scala/org/apache/spark/scheduler/TaskSetManagerSuite.scala b/core/src/test/scala/org/apache/spark/scheduler/TaskSetManagerSuite.scala
index c55de278a6d2..ab2c00e36846 100644
--- a/core/src/test/scala/org/apache/spark/scheduler/TaskSetManagerSuite.scala
+++ b/core/src/test/scala/org/apache/spark/scheduler/TaskSetManagerSuite.scala
@@ -2013,6 +2013,7 @@ class TaskSetManagerSuite
     val conf = new SparkConf()
     conf.set(config.SPECULATION_ENABLED, true)
     conf.set(config.SPECULATION_QUANTILE.key, speculationQuantile.toString)
+    conf.set(config.SPECULATION_MULTIPLIER.key, "1.5")
     // Set the number of slots per executor
     conf.set(config.EXECUTOR_CORES.key, numExecutorCores.toString)
     conf.set(config.CPUS_PER_TASK.key, numCoresPerTask.toString)
@@ -2414,6 +2415,7 @@ class TaskSetManagerSuite
     // minTimeToSpeculation parameter to checkSpeculatableTasks
     val conf = new SparkConf()
       .set(config.SPECULATION_MULTIPLIER, 0.0)
+      .set(config.SPECULATION_QUANTILE, 0.75)
       .set(config.SPECULATION_ENABLED, true)
     sc = new SparkContext("local", "test", conf)
     val ser = sc.env.closureSerializer.newInstance()
diff --git a/docs/configuration.md b/docs/configuration.md
index d3e9f27c4761..d5e2a569fdea 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -2907,7 +2907,7 @@ Apart from these, the following properties are also available, and may be useful
 </tr>
 <tr>
   <td><code>spark.speculation.multiplier</code></td>
-  <td>1.5</td>
+  <td>3</td>
   <td>
     How many times slower a task is than the median to be considered for speculation.
   </td>
@@ -2915,7 +2915,7 @@ Apart from these, the following properties are also available, and may be useful
 </tr>
 <tr>
   <td><code>spark.speculation.quantile</code></td>
-  <td>0.75</td>
+  <td>0.9</td>
   <td>
     Fraction of tasks which must be complete before speculation is enabled for a particular stage.
   </td>
diff --git a/docs/core-migration-guide.md b/docs/core-migration-guide.md
index 8baab5ec082b..5f3560883e59 100644
--- a/docs/core-migration-guide.md
+++ b/docs/core-migration-guide.md
@@ -44,6 +44,8 @@ license: |
 
 - Since Spark 4.0, the default log4j output has shifted from plain text to JSON lines to enhance analyzability. To revert to plain text output, you can either set `spark.log.structuredLogging.enabled` to `false`, or use a custom log4j configuration.
 
+- Since Spark 4.0, Spark performs speculative executions less agressively with `spark.speculation.multiplier=3` and `spark.speculation.quantile=0.9`. To restore the legacy behavior, you can set `spark.speculation.multiplier=1.5` and `spark.speculation.quantile=0.75`.
+
 ## Upgrading from Core 3.4 to 3.5
 
 - Since Spark 3.5, `spark.yarn.executor.failuresValidityInterval` is deprecated. Use `spark.executor.failuresValidityInterval` instead.