diff --git a/Assets/dll/encore.dll b/Assets/dll/encore.dll
index 1686876b33..25eb5482d4 100644
Binary files a/Assets/dll/encore.dll and b/Assets/dll/encore.dll differ
diff --git a/encore/encore b/encore/encore
index c34960de86..c3e7f204c1 160000
--- a/encore/encore
+++ b/encore/encore
@@ -1 +1 @@
-Subproject commit c34960de8689d778ecbb24c425dfa8b1c928fa42
+Subproject commit c3e7f204c1a0a2da62b280ef0a846d0264097b2a
diff --git a/src/BizHawk.Emulation.Cores/Consoles/Nintendo/3DS/Encore.ISettable.cs b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/3DS/Encore.ISettable.cs
index e95bc48501..7794dbc31c 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Nintendo/3DS/Encore.ISettable.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Nintendo/3DS/Encore.ISettable.cs
@@ -26,8 +26,10 @@ namespace BizHawk.Emulation.Cores.Consoles.Nintendo.N3DS
 			"use_virtual_sd" => _syncSettings.UseVirtualSd,
 			"is_new_3ds" => _syncSettings.IsNew3ds,
 			"lle_applets" => _syncSettings.LleApplets,
+			"allow_async_file_io" => !DeterministicEmulation && _syncSettings.AllowAsyncFileIo,
 			"plugin_loader" => _syncSettings.PluginLoaderEnabled,
 			"allow_plugin_loader" => _syncSettings.AllowPluginLoader,
+			"want_determinism" => DeterministicEmulation,
 			"filter_mode" => _settings.FilterMode,
 			"swap_screen" => _settings.SwapScreen,
 			"upright_screen" => _settings.UprightScreen,
@@ -44,7 +46,7 @@ namespace BizHawk.Emulation.Cores.Consoles.Nintendo.N3DS
 			"region_value" => (ulong)_syncSettings.RegionValue,
 			"init_clock" => _syncSettings.UseRealTime && !DeterministicEmulation ? 0UL : 1UL,
 			"init_time" => (ulong)(_syncSettings.InitialTime - _epoch).TotalSeconds,
-			"init_ticks_type" => _syncSettings.RandomInitTicks && !DeterministicEmulation ? 0UL : 01UL,
+			"init_ticks_type" => _syncSettings.RandomInitTicks && !DeterministicEmulation ? 0UL : 1UL,
 			"init_ticks_override" => (ulong)_syncSettings.InitTickCount,
 			"birthmonth" => (ulong)_syncSettings.CFGBirthdayMonth,
 			"birthday" => (ulong)_syncSettings.CFGBirthdayDay,
@@ -331,6 +333,11 @@ namespace BizHawk.Emulation.Cores.Consoles.Nintendo.N3DS
 			[DefaultValue(false)]
 			public bool LleApplets { get; set; }
 
+			[DisplayName("Allow Async File I/O")]
+			[Description("If true, file i/o may be performed asynchronously. May reduce stutters for slow HDDs, but may result in longer load times. Ignored (set to false) when recording a movie.")]
+			[DefaultValue(true)]
+			public bool AllowAsyncFileIo { get; set; }
+
 			public enum ERegionValue
 			{
 				Autodetect = -1,