diff --git a/veilid-core/src/rpc_processor/mod.rs b/veilid-core/src/rpc_processor/mod.rs
index 4d3dee31..b4a06628 100644
--- a/veilid-core/src/rpc_processor/mod.rs
+++ b/veilid-core/src/rpc_processor/mod.rs
@@ -1678,7 +1678,10 @@ impl RPCProcessor {
 
         let send_channel = {
             let inner = self.inner.lock();
-            inner.send_channel.as_ref().unwrap().clone()
+            let Some(send_channel) = inner.send_channel.as_ref().cloned() else {
+                bail!("send channel is closed");
+            };
+            send_channel
         };
         let span_id = Span::current().id();
         send_channel
@@ -1714,7 +1717,10 @@ impl RPCProcessor {
         };
         let send_channel = {
             let inner = self.inner.lock();
-            inner.send_channel.as_ref().unwrap().clone()
+            let Some(send_channel) = inner.send_channel.as_ref().cloned() else {
+                bail!("send channel is closed");
+            };
+            send_channel
         };
         let span_id = Span::current().id();
         send_channel
@@ -1753,7 +1759,10 @@ impl RPCProcessor {
 
         let send_channel = {
             let inner = self.inner.lock();
-            inner.send_channel.as_ref().unwrap().clone()
+            let Some(send_channel) = inner.send_channel.as_ref().cloned() else {
+                bail!("send channel is closed");
+            };
+            send_channel
         };
         let span_id = Span::current().id();
         send_channel
diff --git a/veilid-flutter/example/pubspec.lock b/veilid-flutter/example/pubspec.lock
index f3b8af02..b121351f 100644
--- a/veilid-flutter/example/pubspec.lock
+++ b/veilid-flutter/example/pubspec.lock
@@ -357,6 +357,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.0.2"
+  system_info_plus:
+    dependency: transitive
+    description:
+      name: system_info_plus
+      sha256: b915c811c6605b802f3988859bc2bb79c95f735762a75b5451741f7a2b949d1b
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.0.5"
   term_glyph:
     dependency: transitive
     description:
@@ -395,7 +403,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.1.1"
+    version: "0.1.6"
   win32:
     dependency: transitive
     description:
diff --git a/veilid-flutter/lib/default_config.dart b/veilid-flutter/lib/default_config.dart
index 3917842f..815c0793 100644
--- a/veilid-flutter/lib/default_config.dart
+++ b/veilid-flutter/lib/default_config.dart
@@ -1,7 +1,10 @@
+import 'dart:io';
+
 import 'package:flutter/foundation.dart' show kIsWeb;
 import 'package:path_provider/path_provider.dart';
 import 'package:path/path.dart' as p;
 import 'package:system_info2/system_info2.dart' as sysinfo;
+import 'package:system_info_plus/system_info_plus.dart';
 import 'veilid.dart';
 
 const int megaByte = 1024 * 1024;
@@ -13,10 +16,13 @@ int getLocalSubkeyCacheSize() {
   return 1024;
 }
 
-int getLocalMaxSubkeyCacheMemoryMb() {
+Future<int> getLocalMaxSubkeyCacheMemoryMb() async {
   if (kIsWeb) {
     return 256;
   }
+  if (Platform.isIOS || Platform.isAndroid) {
+    return (await SystemInfoPlus.physicalMemory ?? 2048) ~/ 32;
+  }
   return sysinfo.SysInfo.getTotalPhysicalMemory() ~/ 32 ~/ megaByte;
 }
 
@@ -34,10 +40,13 @@ int getRemoteMaxRecords() {
   return 128;
 }
 
-int getRemoteMaxSubkeyCacheMemoryMb() {
+Future<int> getRemoteMaxSubkeyCacheMemoryMb() async {
   if (kIsWeb) {
     return 256;
   }
+  if (Platform.isIOS || Platform.isAndroid) {
+    return (await SystemInfoPlus.physicalMemory ?? 2048) ~/ 32;
+  }
   return sysinfo.SysInfo.getTotalPhysicalMemory() ~/ 32 ~/ megaByte;
 }
 
@@ -121,10 +130,10 @@ Future<VeilidConfig> getDefaultVeilidConfig(String programName) async {
           minPeerRefreshTimeMs: 60000,
           validateDialInfoReceiptTimeMs: 2000,
           localSubkeyCacheSize: getLocalSubkeyCacheSize(),
-          localMaxSubkeyCacheMemoryMb: getLocalMaxSubkeyCacheMemoryMb(),
+          localMaxSubkeyCacheMemoryMb: await getLocalMaxSubkeyCacheMemoryMb(),
           remoteSubkeyCacheSize: getRemoteSubkeyCacheSize(),
           remoteMaxRecords: getRemoteMaxRecords(),
-          remoteMaxSubkeyCacheMemoryMb: getRemoteMaxSubkeyCacheMemoryMb(),
+          remoteMaxSubkeyCacheMemoryMb: await getRemoteMaxSubkeyCacheMemoryMb(),
           remoteMaxStorageSpaceMb: getRemoteMaxStorageSpaceMb()),
       upnp: true,
       detectAddressChanges: true,
diff --git a/veilid-flutter/pubspec.yaml b/veilid-flutter/pubspec.yaml
index 1adadf0e..d4638878 100644
--- a/veilid-flutter/pubspec.yaml
+++ b/veilid-flutter/pubspec.yaml
@@ -17,6 +17,7 @@ dependencies:
   path_provider: ^2.0.9
   path: ^1.8.0
   system_info2: ^3.0.2
+  system_info_plus: ^0.0.5
   charcode: ^1.3.1
   freezed_annotation: ^2.2.0
   json_annotation: ^4.8.1