diff --git a/db/sqlite.go b/db/sqlite.go
index 3bd6b78..03e362d 100644
--- a/db/sqlite.go
+++ b/db/sqlite.go
@@ -9,6 +9,10 @@ import (
 	"strings"
 	"time"
 )
+/*
+sqlite extract: https://stackoverflow.com/questions/15448373/how-to-dump-a-file-stored-in-a-sqlite-database-as-a-blob
+sqlite3 my.db "SELECT writefile('object0.gz', MyBlob) FROM MyTable WHERE id = 1"
+*/
 
 const migrateScript = `
 alter table blocks add mtime integer default 0;
diff --git a/mapblockparser/metadata.go b/mapblockparser/metadata.go
index fb29ee7..e692e65 100644
--- a/mapblockparser/metadata.go
+++ b/mapblockparser/metadata.go
@@ -11,6 +11,10 @@ import (
 	"strings"
 )
 
+/*
+lua vm: https://github.com/yuin/gopher-lua
+*/
+
 const (
 	INVENTORY_TERMINATOR = "EndInventory"
 	INVENTORY_END        = "EndInventoryList"
@@ -103,7 +107,7 @@ func parseMetadata(mapblock *MapBlock, data []byte) (int, error) {
 			txt := scanner.Text()
 			offset += len(txt) + 1
 
-			log.WithFields(logrus.Fields{"txt":txt, "position":position}).Info("Parsing inventory")
+			log.WithFields(logrus.Fields{"txt":txt, "position":position}).Trace("Parsing inventory")
 
 
 			if strings.HasPrefix(txt, INVENTORY_START) {
diff --git a/mapobjectdb/accessor.go b/mapobjectdb/accessor.go
index 275fce0..4c92b60 100644
--- a/mapobjectdb/accessor.go
+++ b/mapobjectdb/accessor.go
@@ -4,6 +4,12 @@ import (
 	"mapserver/coords"
 )
 
+/*
+sqlite perf: https://stackoverflow.com/questions/1711631/improve-insert-per-second-performance-of-sqlite?rq=1
+PRAGMA synchronous = OFF
+PRAGMA journal_mode = MEMORY
+*/
+
 type Tile struct {
 	Pos   *coords.TileCoords
 	Data  []byte
diff --git a/mapobjectdb/sqlite_migrate.go b/mapobjectdb/sqlite_migrate.go
index e182f93..71a2c83 100644
--- a/mapobjectdb/sqlite_migrate.go
+++ b/mapobjectdb/sqlite_migrate.go
@@ -30,6 +30,9 @@ create table if not exists tiles(
   zoom int,
   primary key(x,y,zoom,layerid)
 );
+
+-- PRAGMA synchronous = OFF;
+-- PRAGMA journal_mode = MEMORY;
 `
 
 type Sqlite3Accessor struct {