diff --git a/OptimizelySDK.Tests/OptimizelyFactoryTest.cs b/OptimizelySDK.Tests/OptimizelyFactoryTest.cs
index 1ae01b44..92d2a23b 100644
--- a/OptimizelySDK.Tests/OptimizelyFactoryTest.cs
+++ b/OptimizelySDK.Tests/OptimizelyFactoryTest.cs
@@ -1,6 +1,6 @@
 /**
  *
- *    Copyright 2020, Optimizely and contributors
+ *    Copyright 2020-2021, Optimizely and contributors
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -62,7 +62,6 @@ public void TestOptimizelyInstanceUsingConfigFile()
             optimizely.Dispose();
         }
 
-
         [Test]
         public void TestProjectConfigManagerUsingSDKKey()
         {
@@ -78,8 +77,8 @@ public void TestProjectConfigManagerUsingSDKKey()
                 Url = "https://cdn.optimizely.com/datafiles/my-sdk-key.json",
                 LastModified = "",
                 AutoUpdate = true,
-                BlockingTimeout = TimeSpan.FromSeconds(15),
-                PollingInterval = TimeSpan.FromMinutes(5)
+                BlockingTimeout = TimeSpan.FromSeconds(30),
+                PollingInterval = TimeSpan.FromMilliseconds(2023)
             };
 
             Assert.AreEqual(actualConfigManagerProps, expectedConfigManagerProps);
@@ -102,8 +101,8 @@ public void TestProjectConfigManagerWithDatafileAccessToken()
                 LastModified = "",
                 DatafileAccessToken = "access-token",
                 AutoUpdate = true,
-                BlockingTimeout = TimeSpan.FromSeconds(15),
-                PollingInterval = TimeSpan.FromMinutes(5)
+                BlockingTimeout = TimeSpan.FromSeconds(30),
+                PollingInterval = TimeSpan.FromMilliseconds(2023)
             };
 
             Assert.AreEqual(actualConfigManagerProps, expectedConfigManagerProps);
@@ -111,6 +110,31 @@ public void TestProjectConfigManagerWithDatafileAccessToken()
             optimizely.Dispose();
         }
 
+        [Test]
+        public void TestOptimizelyInstanceUsingConfigNotUseFactoryClassBlockingTimeoutAndPollingInterval()
+        {
+            OptimizelyFactory.SetBlockingTimeOutPeriod(TimeSpan.FromSeconds(30));
+            OptimizelyFactory.SetPollingInterval(TimeSpan.FromMilliseconds(2023));
+            var optimizely = OptimizelyFactory.NewDefaultInstance();
+            // Check values are loaded from app.config or not.
+            var projectConfigManager = optimizely.ProjectConfigManager as HttpProjectConfigManager;
+            Assert.NotNull(projectConfigManager);
+
+            var actualConfigManagerProps = new ProjectConfigManagerProps(projectConfigManager);
+            var expectedConfigManagerProps = new ProjectConfigManagerProps
+            {
+                Url = "www.testurl.com",
+                LastModified = "",
+                AutoUpdate = true,
+                DatafileAccessToken = "testingtoken123",
+                BlockingTimeout = TimeSpan.FromMilliseconds(10000),
+                PollingInterval = TimeSpan.FromMilliseconds(2000)
+            };
+
+            Assert.AreEqual(actualConfigManagerProps, expectedConfigManagerProps);
+            optimizely.Dispose();
+        }
+
         [Test]
         public void TestProjectConfigManagerWithCustomProjectConfigManager()
         {
diff --git a/OptimizelySDK/OptimizelyFactory.cs b/OptimizelySDK/OptimizelyFactory.cs
index 95d74960..8e78bcf8 100644
--- a/OptimizelySDK/OptimizelyFactory.cs
+++ b/OptimizelySDK/OptimizelyFactory.cs
@@ -1,5 +1,5 @@
 /* 
- * Copyright 2019-2020, Optimizely
+ * Copyright 2019-2021, Optimizely
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use file except in compliance with the License.
@@ -35,6 +35,8 @@ public static class OptimizelyFactory
     {
         private static int MaxEventBatchSize;
         private static TimeSpan MaxEventFlushInterval;
+        private static TimeSpan PollingInterval;
+        private static TimeSpan BlockingTimeOutPeriod;
         private static ILogger OptimizelyLogger;
         private const string ConfigSectionName = "optlySDKConfigSection";
 
@@ -49,6 +51,16 @@ public static void SetFlushInterval(TimeSpan flushInterval)
             MaxEventFlushInterval = flushInterval;
         }
 
+        public static void SetPollingInterval(TimeSpan pollingInterval)
+        {
+            PollingInterval = pollingInterval;
+        }
+
+        public static void SetBlockingTimeOutPeriod(TimeSpan blockingTimeOutPeriod)
+        {
+            BlockingTimeOutPeriod = blockingTimeOutPeriod;
+        }
+
         public static void SetLogger(ILogger logger)
         {
             OptimizelyLogger = logger;
@@ -76,7 +88,6 @@ public static Optimizely NewDefaultInstance()
             var eventDispatcher = new DefaultEventDispatcher(logger);
             var builder = new HttpProjectConfigManager.Builder();
             var notificationCenter = new NotificationCenter();
-            
             var configManager = builder
                 .WithSdkKey(httpProjectConfigElement.SDKKey)
                 .WithUrl(httpProjectConfigElement.Url)
@@ -111,7 +122,7 @@ public static Optimizely NewDefaultInstance()
         }
 #endif
 
-            public static Optimizely NewDefaultInstance(string sdkKey)
+        public static Optimizely NewDefaultInstance(string sdkKey)
         {
             return NewDefaultInstance(sdkKey, null);
         }
@@ -128,6 +139,8 @@ public static Optimizely NewDefaultInstance(string sdkKey, string fallback, stri
                 .WithSdkKey(sdkKey)
                 .WithDatafile(fallback)
                 .WithLogger(logger)
+                .WithPollingInterval(PollingInterval)
+                .WithBlockingTimeoutPeriod(BlockingTimeOutPeriod)
                 .WithErrorHandler(errorHandler)
                 .WithAccessToken(datafileAuthToken)
                 .WithNotificationCenter(notificationCenter)
@@ -160,6 +173,8 @@ public static Optimizely NewDefaultInstance(string sdkKey, string fallback)
                 .WithSdkKey(sdkKey)
                 .WithDatafile(fallback)
                 .WithLogger(logger)
+                .WithPollingInterval(PollingInterval)
+                .WithBlockingTimeoutPeriod(BlockingTimeOutPeriod)
                 .WithErrorHandler(errorHandler)
                 .WithNotificationCenter(notificationCenter)
                 .Build(true);