diff --git a/tools/wterl-b_b.config b/tools/wterl-b_b.config
index 508a270..5bc2685 100644
--- a/tools/wterl-b_b.config
+++ b/tools/wterl-b_b.config
@@ -25,7 +25,7 @@
 
 {mode, max}.
 {duration, 10}.
-{concurrent, 4}.
+{concurrent, 16}.
 {report_interval, 1}.
 {pb_timeout_general, 1000}. % ms
 %{pb_timeout_read, ?}.
@@ -43,7 +43,9 @@
 {wterl, [
         {connection, [
                       {create, true},
-                      {sync, false},
+                      {session_sync, false},
+		      {transaction_sync, "none"},
+		      {log, [{enabled, false}]},
                       {session_max, 1024},
                       {cache_size, 4294967296},
                       {verbose, []},
@@ -58,11 +60,11 @@
                      ]},
         {session, [ {isolation, "snapshot"} ]},
         {table_uri, "lsm:test"},
+	{lsm_merge_threads, 2},
         {table, [
                  {internal_page_max, "128K"},
                  {leaf_page_max, "128K"},
                  {lsm_chunk_size, "25MB"},
-                 {prefix_compression, false},
                  {lsm_bloom_newest, true},
                  {lsm_bloom_oldest, true} ,
                  {lsm_bloom_bit_count, 128},
@@ -76,7 +78,9 @@
 {wterl_, [
         {connection, [
                       {create, true},
-                      {sync, false},
+                      {session_sync, false},
+		      {transaction_sync, "none"},
+		      {log, [{enabled, false}]},
                       {session_max, 1024},
                       {cache_size, 4294967296},
                       {verbose, []},
@@ -93,7 +97,6 @@
         {session, [ {isolation, "snapshot"} ]},
         {table_uri, "table:test"},
         {table, [
-                 {prefix_compression, false},
                  {block_compressor, "snappy"} % bzip2
                 ]}
         ]}.