diff --git a/vinegarUtil/webLRU.go b/vinegarUtil/webLRU.go
index 362f6d5..6e48ea6 100644
--- a/vinegarUtil/webLRU.go
+++ b/vinegarUtil/webLRU.go
@@ -9,7 +9,7 @@ import (
 )
 
 const (
-	DefaultCacheTimeInMinutes = 1
+	DefaultCacheTimeInMinutes = 15
 )
 
 type (
@@ -221,6 +221,7 @@ func GuessMimetype(filePath string) string {
 	case "ico":
 		return "image/vnd.microsoft.icon"
 	case "jpg":
+		fallthrough
 	case "jpeg":
 		return "image/jpeg"
 	case "js":