diff --git a/services/core/java/com/android/server/net/NetworkStatsCollection.java b/services/core/java/com/android/server/net/NetworkStatsCollection.java
index 6aefe41891..557fa89444 100644
--- a/services/core/java/com/android/server/net/NetworkStatsCollection.java
+++ b/services/core/java/com/android/server/net/NetworkStatsCollection.java
@@ -54,6 +54,8 @@ import android.util.proto.ProtoOutputStream;
 
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.util.ArrayUtils;
+import com.android.internal.util.FastDataInput;
+import com.android.internal.util.FastDataOutput;
 import com.android.internal.util.FileRotator;
 import com.android.internal.util.IndentingPrintWriter;
 
@@ -89,6 +91,9 @@ public class NetworkStatsCollection implements FileRotator.Reader, FileRotator.W
     /** File header magic number: "ANET" */
     private static final int FILE_MAGIC = 0x414E4554;
 
+    /** Default buffer size from BufferedInputStream */
+    private static final int BUFFER_SIZE = 8192;
+
     private static final int VERSION_NETWORK_INIT = 1;
 
     private static final int VERSION_UID_INIT = 1;
@@ -434,7 +439,8 @@ public class NetworkStatsCollection implements FileRotator.Reader, FileRotator.W
 
     @Override
     public void read(InputStream in) throws IOException {
-        read((DataInput) new DataInputStream(in));
+        final FastDataInput dataIn = new FastDataInput(in, BUFFER_SIZE);
+        read(dataIn);
     }
 
     private void read(DataInput in) throws IOException {
@@ -473,8 +479,9 @@ public class NetworkStatsCollection implements FileRotator.Reader, FileRotator.W
 
     @Override
     public void write(OutputStream out) throws IOException {
-        write((DataOutput) new DataOutputStream(out));
-        out.flush();
+        final FastDataOutput dataOut = new FastDataOutput(out, BUFFER_SIZE);
+        write(dataOut);
+        dataOut.flush();
     }
 
     private void write(DataOutput out) throws IOException {