diff --git a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/PhysicalOptimizationConfig.java b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/PhysicalOptimizationConfig.java
index 2efc4d6..399a6e0 100644
--- a/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/PhysicalOptimizationConfig.java
+++ b/hyracks-algebricks/hyracks-algebricks-core/src/main/java/edu/uci/ics/hyracks/algebricks/core/rewriter/base/PhysicalOptimizationConfig.java
@@ -17,8 +17,8 @@
     public PhysicalOptimizationConfig() {
         int frameSize = 131072;
         setInt(FRAMESIZE, frameSize);
-        setInt(MAX_FRAMES_EXTERNAL_SORT, (int) (((long) 340 * MB) / frameSize));
-        setInt(MAX_FRAMES_EXTERNAL_GROUP_BY, (int) (((long) 340 * MB) / frameSize));
+        setInt(MAX_FRAMES_EXTERNAL_SORT, (int) (((long) 256 * MB) / frameSize));
+        setInt(MAX_FRAMES_EXTERNAL_GROUP_BY, (int) (((long) 256 * MB) / frameSize));
 
         // use http://www.rsok.com/~jrm/printprimes.html to find prime numbers
         setInt(DEFAULT_HASH_GROUP_TABLE_SIZE, 10485767);
diff --git a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/util/JoinUtils.java b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/util/JoinUtils.java
index ff1c4f1..80f62be 100644
--- a/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/util/JoinUtils.java
+++ b/hyracks-algebricks/hyracks-algebricks-rewriter/src/main/java/edu/uci/ics/hyracks/algebricks/rewriter/util/JoinUtils.java
@@ -53,7 +53,7 @@
     private final static int MAX_RECORDS_PER_FRAME = 2048;
     private final static int DEFAULT_FRAME_SIZE = 131072;
     private final static int MAX_LEFT_INPUT_SIZE_HYBRID_HASH = (int) (140L * 1024 * MB / DEFAULT_FRAME_SIZE);
-    private final static int DEFAULT_MEMORY_SIZE_HYBRID_HASH = (int) (340 * MB / DEFAULT_FRAME_SIZE);
+    private final static int DEFAULT_MEMORY_SIZE_HYBRID_HASH = (int) (256 * MB / DEFAULT_FRAME_SIZE);
 
     public static void setJoinAlgorithmAndExchangeAlgo(AbstractBinaryJoinOperator op, IOptimizationContext context)
             throws AlgebricksException {
diff --git a/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/dataflow/AbstractLSMIndexDataflowHelper.java b/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/dataflow/AbstractLSMIndexDataflowHelper.java
index 70db775..d1d70e8 100644
--- a/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/dataflow/AbstractLSMIndexDataflowHelper.java
+++ b/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/dataflow/AbstractLSMIndexDataflowHelper.java
@@ -26,7 +26,7 @@
 public abstract class AbstractLSMIndexDataflowHelper extends IndexDataflowHelper {
 
     protected static int DEFAULT_MEM_PAGE_SIZE = 32768;
-    protected static int DEFAULT_MEM_NUM_PAGES = 1000;
+    protected static int DEFAULT_MEM_NUM_PAGES = 10;
 
     protected final int memPageSize;
     protected final int memNumPages;