diff --git a/main.go b/main.go
index 0dcc438..5e26e54 100644
--- a/main.go
+++ b/main.go
@@ -127,7 +127,7 @@ func init() {
 		},
 		{
 			Name:     "est-download-speed",
-			DefValue: "5MB",
+			DefValue: "1MB",
 			Description: `The estimated download speed per second, to govern the timeouts downloading CAR files.
 Be conservative to leave enough room for network instability.`,
 		},
diff --git a/service/store/store.go b/service/store/store.go
index 9e33045..0e8dc5b 100644
--- a/service/store/store.go
+++ b/service/store/store.go
@@ -49,7 +49,7 @@ var (
 	DefaultDataURIFetchTimeout = time.Hour * 10
 
 	// MaxDataURIFetchConcurrency is the maximum number of data uri fetches that will be handled concurrently.
-	MaxDataURIFetchConcurrency = 10
+	MaxDataURIFetchConcurrency = 3
 
 	// ErrBidNotFound indicates the requested bid was not found.
 	ErrBidNotFound = errors.New("bid not found")