diff --git a/trackerlogic.h b/trackerlogic.h
index c85c520..6f0e09b 100644
--- a/trackerlogic.h
+++ b/trackerlogic.h
@@ -38,10 +38,10 @@ typedef time_t         ot_time;
 #define OT_POOLS_TIMEOUT 300
 #define NOW              (time(NULL)/OT_POOLS_TIMEOUT)
 
-#define OT_VECTOR_MIN_MEMBERS   128
-#define OT_VECTOR_GROW_RATIO    2
-#define OT_VECTOR_SHRINK_THRESH 3
-#define OT_VECTOR_SHRINK_RATIO  2
+#define OT_VECTOR_MIN_MEMBERS   16
+#define OT_VECTOR_GROW_RATIO    4
+#define OT_VECTOR_SHRINK_THRESH 5
+#define OT_VECTOR_SHRINK_RATIO  4
 typedef struct {
   void   *data;
   size_t  size;