diff --git a/eth/core/chain.go b/eth/core/chain.go
index 16c103e38..17a21371c 100644
--- a/eth/core/chain.go
+++ b/eth/core/chain.go
@@ -40,8 +40,8 @@ import (
 	"github.com/ethereum/go-ethereum/trie"
 )
 
-// By default we are storing up to 1024 items in each cache.
-const defaultCacheSize = 1024
+// By default we are storing up to 512 items in each cache.
+const defaultCacheSize = 512
 
 // Compile-time check to ensure that `blockchain` implements the `Blockchain` api.
 var _ Blockchain = (*blockchain)(nil)