diff --git a/server/app/config.go b/server/app/config.go
index 2757280..3fff624 100644
--- a/server/app/config.go
+++ b/server/app/config.go
@@ -10,16 +10,22 @@ import (
 )
 
 type Config struct {
-	Port                int              `json:"port"`
-	EnablePrometheus    bool             `json:"enableprometheus"`
-	EnableRendering     bool             `json:"enablerendering"`
-	Webdev              bool             `json:"webdev"`
-	WebApi              *WebApiConfig    `json:"webapi"`
-	Layers              []*layer.Layer   `json:"layers"`
-	RenderingFetchLimit int              `json:"renderingfetchlimit"`
-	RenderingJobs       int              `json:"renderingjobs"`
-	RenderingQueue      int              `json:"renderingqueue"`
-	MapObjects          *MapObjectConfig `json:"mapobjects"`
+	Port                int                     `json:"port"`
+	EnablePrometheus    bool                    `json:"enableprometheus"`
+	EnableRendering     bool                    `json:"enablerendering"`
+	Webdev              bool                    `json:"webdev"`
+	WebApi              *WebApiConfig           `json:"webapi"`
+	Layers              []*layer.Layer          `json:"layers"`
+	RenderingFetchLimit int                     `json:"renderingfetchlimit"`
+	RenderingJobs       int                     `json:"renderingjobs"`
+	RenderingQueue      int                     `json:"renderingqueue"`
+	MapObjects          *MapObjectConfig        `json:"mapobjects"`
+	MapBlockAccessorCfg *MapBlockAccessorConfig `json:"mapblockaccessor"`
+}
+
+type MapBlockAccessorConfig struct {
+	Expiretime string `json:"expiretime"`
+	Purgetime  string `json:"purgetime"`
 }
 
 type MapObjectConfig struct {
@@ -106,6 +112,11 @@ func ParseConfig(filename string) (*Config, error) {
 		ATM:           true,
 	}
 
+	mapblockaccessor := MapBlockAccessorConfig{
+		Expiretime: "500ms",
+		Purgetime:  "1000ms",
+	}
+
 	cfg := Config{
 		Port:                8080,
 		EnableRendering:     true,
@@ -117,6 +128,7 @@ func ParseConfig(filename string) (*Config, error) {
 		RenderingJobs:       runtime.NumCPU(),
 		RenderingQueue:      100,
 		MapObjects:          &mapobjs,
+		MapBlockAccessorCfg: &mapblockaccessor,
 	}
 
 	info, err := os.Stat(filename)
diff --git a/server/app/setup.go b/server/app/setup.go
index b32bda7..869021f 100644
--- a/server/app/setup.go
+++ b/server/app/setup.go
@@ -13,12 +13,13 @@ import (
 	"mapserver/tiledb"
 	"mapserver/tilerenderer"
 	"mapserver/worldconfig"
-
-	"github.com/sirupsen/logrus"
+	"time"
 
 	"io/ioutil"
 	"os"
 
+	"github.com/sirupsen/logrus"
+
 	"errors"
 )
 
@@ -58,7 +59,17 @@ func Setup(p params.ParamsType, cfg *Config) *App {
 	}
 
 	//mapblock accessor
-	a.BlockAccessor = mapblockaccessor.NewMapBlockAccessor(a.Blockdb)
+	expireDuration, err := time.ParseDuration(cfg.MapBlockAccessorCfg.Expiretime)
+	if err != nil {
+		panic(err)
+	}
+
+	purgeDuration, err := time.ParseDuration(cfg.MapBlockAccessorCfg.Purgetime)
+	if err != nil {
+		panic(err)
+	}
+
+	a.BlockAccessor = mapblockaccessor.NewMapBlockAccessor(a.Blockdb, expireDuration, purgeDuration)
 
 	//color mapping
 	a.Colormapping = colormapping.NewColorMapping()
diff --git a/server/mapblockaccessor/mapblockaccessor.go b/server/mapblockaccessor/mapblockaccessor.go
index c1d224e..20b7845 100644
--- a/server/mapblockaccessor/mapblockaccessor.go
+++ b/server/mapblockaccessor/mapblockaccessor.go
@@ -21,8 +21,8 @@ func getKey(pos *coords.MapBlockCoords) string {
 	return fmt.Sprintf("Coord %d/%d/%d", pos.X, pos.Y, pos.Z)
 }
 
-func NewMapBlockAccessor(accessor db.DBAccessor) *MapBlockAccessor {
-	c := cache.New(500*time.Millisecond, 1000*time.Millisecond)
+func NewMapBlockAccessor(accessor db.DBAccessor, expiretime, purgetime time.Duration) *MapBlockAccessor {
+	c := cache.New(expiretime, purgetime)
 
 	return &MapBlockAccessor{
 		accessor: accessor,
diff --git a/server/mapblockaccessor/mapblockaccessor_test.go b/server/mapblockaccessor/mapblockaccessor_test.go
index dc68d32..0bcc037 100644
--- a/server/mapblockaccessor/mapblockaccessor_test.go
+++ b/server/mapblockaccessor/mapblockaccessor_test.go
@@ -1,13 +1,15 @@
 package mapblockaccessor
 
 import (
-	"github.com/sirupsen/logrus"
 	"io/ioutil"
 	"mapserver/coords"
 	"mapserver/db/sqlite"
 	"mapserver/testutils"
 	"os"
 	"testing"
+	"time"
+
+	"github.com/sirupsen/logrus"
 )
 
 func TestSimpleAccess(t *testing.T) {
@@ -30,7 +32,7 @@ func TestSimpleAccess(t *testing.T) {
 		panic(err)
 	}
 
-	cache := NewMapBlockAccessor(a)
+	cache := NewMapBlockAccessor(a, 500*time.Millisecond, 1000*time.Millisecond)
 	mb, err := cache.GetMapBlock(coords.NewMapBlockCoords(0, 0, 0))
 
 	if err != nil {