diff --git a/src/main/java/jp/sf/fess/solr/IndexUpdater.java b/src/main/java/jp/sf/fess/solr/IndexUpdater.java
index 93b91f04f..77453c5f8 100644
--- a/src/main/java/jp/sf/fess/solr/IndexUpdater.java
+++ b/src/main/java/jp/sf/fess/solr/IndexUpdater.java
@@ -94,7 +94,7 @@ public class IndexUpdater extends Thread {
     @Resource
     protected ScreenShotManager screenShotManager;
 
-    public int maxDocumentCacheSize = 10;
+    public int maxDocumentCacheSize = 5;
 
     protected boolean finishCrawling = false;
 
diff --git a/src/main/webapp/WEB-INF/cmd/resources/app.dicon b/src/main/webapp/WEB-INF/cmd/resources/app.dicon
index 582c0aa15..0cae9c6cf 100644
--- a/src/main/webapp/WEB-INF/cmd/resources/app.dicon
+++ b/src/main/webapp/WEB-INF/cmd/resources/app.dicon
@@ -32,7 +32,7 @@
 	<component name="indexUpdater" class="jp.sf.fess.solr.IndexUpdater"
 		instance="prototype">
 		<!-- 
-		<property name="maxDocumentCacheSize">10</property>
+		<property name="maxDocumentCacheSize">5</property>
 		<property name="unprocessedDocumentSize">100</property>
 		<property name="threadDump">false</property>
 		<initMethod name="addBoostDocumentRule">