diff --git a/android/src/main/java/expo/modules/network/NetworkModule.kt b/android/src/main/java/expo/modules/network/NetworkModule.kt
index d21ae4b45d97d0dd113c4ffda4ada529ed5ef653..27ddcc08e0cccecb45105bf0c73f904fdada2854 100644
--- a/android/src/main/java/expo/modules/network/NetworkModule.kt
+++ b/android/src/main/java/expo/modules/network/NetworkModule.kt
@@ -36,6 +36,22 @@ class NetworkModule : Module() {
 
   private val emitRunnable = Runnable { emitNetworkState() }
 
+  /**
+   * The last state handed to JS. Android calls `onCapabilitiesChanged` for any
+   * change in a network's capabilities (a new bandwidth estimate, say), which
+   * on mobile data is several times a minute, and each call woke the JS thread
+   * to hear the same three values again, in the background too. Only a state
+   * that differs is sent now (Resonus #221).
+   */
+  private var lastSentState: String? = null
+
+  private fun sendIfChanged(state: Bundle) {
+    val key = "${state.getString("type")}|${state.getBoolean("isConnected")}|${state.getBoolean("isInternetReachable")}"
+    if (key == lastSentState) return
+    lastSentState = key
+    sendEvent(NETWORK_STATE_EVENT_NAME, state)
+  }
+
   private val networkCallback = object : ConnectivityManager.NetworkCallback() {
     override fun onAvailable(network: android.net.Network) {
       asyncEmitNetworkState(DELAY_MS)
@@ -73,7 +89,7 @@ class NetworkModule : Module() {
               putBoolean("isInternetReachable", false)
               putBoolean("isConnected", false)
             }
-            sendEvent(NETWORK_STATE_EVENT_NAME, result)
+            sendIfChanged(result)
           } else {
             emitNetworkState()
           }
@@ -164,7 +180,7 @@ class NetworkModule : Module() {
   private fun emitNetworkState() {
     try {
       val networkState = fetchNetworkState()
-      sendEvent(NETWORK_STATE_EVENT_NAME, networkState)
+      sendIfChanged(networkState)
     } catch (e: SecurityException) {
       Log.w(TAG, "expo-network could not read network state: missing ACCESS_NETWORK_STATE permission", e)
     } catch (e: Exception) {