Add in flag to IStatable to hint to the frontend that it should avoid rewind (not entire sure with the name, maybe SlowStates would have been better? trivial to mass-rename anyways)

Add in logic to not create the main rewinder if this flag is true, and add in logic to tastudio to avoid the main greenzone captures (instead only capture on branch save/load)

src/BizHawk.Client.Common/config/RewindConfig.cs

@@ -53,6 +53,7 @@
 		public bool UseCompression { get; set; } = false;
 		public bool UseDelta { get; set; } = false;
 		public bool Enabled { get; set; } = true;
+		public bool AllowSlowStates { get; set; } = false; // TODO: Hook up in UI
 		public long BufferSize { get; set; } = 512; // in mb
 		public bool UseFixedRewindInterval { get; set; } = false;
 		public int TargetFrameLength { get; set; } = 600;

src/BizHawk.Client.Common/movie/tasproj/TasMovie.cs

@@ -196,7 +196,7 @@ namespace BizHawk.Client.Common
 			LagLog[Emulator.Frame] = _inputPollable.IsLagFrame;
 
 			// We will forbibly capture a state for the last edited frame (requested by #916 for case of "platforms with analog stick")
-			TasStateManager.Capture(Emulator.Frame, Emulator.AsStatable(), Emulator.Frame == LastEditedFrame - 1);
+			TasStateManager.Capture(Emulator.Frame, Emulator.AsStatable(), !Emulator.AsStatable().AvoidRewind && Emulator.Frame == LastEditedFrame - 1);
 		}
 
 		

src/BizHawk.Client.Common/movie/tasproj/ZwinderStateManager.cs

@@ -334,6 +334,12 @@ namespace BizHawk.Client.Common
 				return;
 			}
 
+			// avoid capturing in this case
+			if (source.AvoidRewind)
+			{
+				return;
+			}
+
 			_current.Capture(frame,
 				s =>
 				{
@@ -372,8 +378,7 @@ namespace BizHawk.Client.Common
 								AddToReserved(state2);
 							}
 						});
-				},
+				});
-				force);
 		}
 
 		// Returns whether or not a frame has a reserved state within the frame interval on either side of it

src/BizHawk.Client.EmuHawk/MainForm.cs

@@ -1064,7 +1064,7 @@ namespace BizHawk.Client.EmuHawk
 		public void CreateRewinder()
 		{
 			Rewinder?.Dispose();
-			Rewinder = Emulator.HasSavestates() && Config.Rewind.Enabled
+			Rewinder = Emulator.HasSavestates() && Config.Rewind.Enabled && (!Emulator.AsStatable().AvoidRewind || Config.Rewind.AllowSlowStates)
 				? Config.Rewind.UseDelta
 					? new ZeldaWinder(Emulator.AsStatable(), Config.Rewind)
 					: new Zwinder(Emulator.AsStatable(), Config.Rewind)

src/BizHawk.Client.EmuHawk/tools/TAStudio/BookmarksBranchesBox.cs

@@ -174,16 +174,40 @@ namespace BizHawk.Client.EmuHawk
 		public TasBranch SelectedBranch
 			=> BranchView.AnyRowsSelected ? Branches[BranchView.FirstSelectedRowIndex] : null;
 
+		// to avoid a double (potentially slow) state
+		private class BufferedStatable : IStatable
+		{
+			private readonly Lazy<byte[]> _bufferedState;
+			public byte[] BufferedState => _bufferedState.Value;
+
+			public BufferedStatable(IStatable statable)
+			{
+				_bufferedState = new(statable.CloneSavestate);
+				AvoidRewind = statable.AvoidRewind;
+			}
+
+			public bool AvoidRewind { get; }
+
+			public void SaveStateBinary(BinaryWriter writer)
+				=> writer.Write(BufferedState);
+
+			public void LoadStateBinary(BinaryReader reader)
+				=> throw new NotImplementedException();
+		}
+
 		private TasBranch CreateBranch()
 		{
-			return new TasBranch
+			var bufferedStatable = new BufferedStatable(Tastudio.Emulator.AsStatable());
+			Movie.TasStateManager.Capture(Tastudio.Emulator.Frame, bufferedStatable, bufferedStatable.AvoidRewind);
+
+			return new()
 			{
 				Frame = Tastudio.Emulator.Frame,
-				CoreData = Tastudio.StatableEmulator.CloneSavestate(),
+				CoreData = bufferedStatable.BufferedState,
 				InputLog = Movie.GetLogEntries().Clone(),
 				CoreFrameBuffer = MainForm.MakeScreenshotImage(),
 				OSDFrameBuffer = MainForm.CaptureOSD(),
-				ChangeLog = new TasMovieChangeLog(Movie),
+				ChangeLog = new(Movie),
 				TimeStamp = DateTime.Now,
 				Markers = Movie.Markers.DeepClone(),
 				UserText = Movie.Branches.NewBranchText
@@ -199,8 +223,8 @@ namespace BizHawk.Client.EmuHawk
 			}
 
 			Movie.LoadBranch(branch);
-			Tastudio.LoadState(new KeyValuePair<int, Stream>(branch.Frame, new MemoryStream(branch.CoreData, false)));
+			Tastudio.LoadState(new(branch.Frame, new MemoryStream(branch.CoreData, false)));
-			Movie.TasStateManager.Capture(Tastudio.Emulator.Frame, Tastudio.Emulator.AsStatable());
+			Movie.TasStateManager.Capture(Tastudio.Emulator.Frame, Tastudio.Emulator.AsStatable(), Tastudio.Emulator.AsStatable().AvoidRewind);
 			Tastudio.MainForm.QuickBmpFile.Copy(new BitmapBufferVideoProvider(branch.CoreFrameBuffer), Tastudio.VideoProvider);
 
 			if (Tastudio.Settings.OldControlSchemeForBranches && Tastudio.TasPlaybackBox.RecordingMode)

src/BizHawk.Emulation.Common/Base Implementations/StateSerializer.cs

@@ -28,6 +28,8 @@ namespace BizHawk.Emulation.Common
 		/// </summary>
 		public Action LoadStateCallback { get; set; }
 
+		public bool AvoidRewind => false;
+
 		public void SaveStateText(TextWriter writer)
 		{
 			_syncState(Serializer.CreateTextWriter(writer));

src/BizHawk.Emulation.Common/Interfaces/Services/IStatable.cs

@@ -13,6 +13,7 @@ namespace BizHawk.Emulation.Common
 	/// </summary>
 	public interface IStatable : IEmulatorService
 	{
+		bool AvoidRewind { get; }
 		void SaveStateBinary(BinaryWriter writer);
 		void LoadStateBinary(BinaryReader reader);
 	}

src/BizHawk.Emulation.Cores/Arcades/MAME/MAME.IStatable.cs

@@ -7,6 +7,8 @@ namespace BizHawk.Emulation.Cores.Arcades.MAME
 {
 	public partial class MAME : IStatable
 	{
+		public bool AvoidRewind => false;
+
 		public void SaveStateBinary(BinaryWriter writer)
 		{
 			using (_exe.EnterExit())

src/BizHawk.Emulation.Cores/Calculators/Emu83/Emu83.IStatable.cs

@@ -9,6 +9,8 @@ namespace BizHawk.Emulation.Cores.Calculators.Emu83
 	{
 		private readonly byte[] _stateBuf = new byte[LibEmu83.TI83_GetStateSize()];
 
+		public bool AvoidRewind => false;
+
 		public void SaveStateBinary(BinaryWriter writer)
 		{
 			if (!LibEmu83.TI83_SaveState(Context, _stateBuf))

src/BizHawk.Emulation.Cores/Computers/AppleII/AppleII.IStatable.cs

@@ -7,6 +7,8 @@ namespace BizHawk.Emulation.Cores.Computers.AppleII
 {
 	public partial class AppleII : ITextStatable
 	{
+		public bool AvoidRewind => false;
+
 		public void SaveStateText(TextWriter writer)
 		{
 			SyncState(new AppleSerializer(writer));

src/BizHawk.Emulation.Cores/Consoles/Atari/lynx/Lynx.IStatable.cs

@@ -8,6 +8,8 @@ namespace BizHawk.Emulation.Cores.Atari.Lynx
 {
 	public partial class Lynx : ITextStatable
 	{
+		public bool AvoidRewind => false;
+
 		public void SaveStateText(TextWriter writer)
 		{
 			var s = new TextState<TextStateData>();

src/BizHawk.Emulation.Cores/Consoles/Nintendo/3DS/Citra.IStatable.cs

@@ -9,6 +9,8 @@ namespace BizHawk.Emulation.Cores.Consoles.Nintendo.N3DS
 	{
 		private byte[] _stateBuf = Array.Empty<byte>();
 
+		public bool AvoidRewind => true;
+
 		public void SaveStateBinary(BinaryWriter writer)
 		{
 			var stateLen = _core.Citra_StartSaveState(_context);

src/BizHawk.Emulation.Cores/Consoles/Nintendo/3DS/Citra.cs

@@ -151,6 +151,9 @@ namespace BizHawk.Emulation.Cores.Consoles.Nintendo.N3DS
 			}
 
 			InitMemoryDomains();
+			// for some reason, if a savestate is created on frame 0, Citra will crash if another savestate is made after loading that state
+			// advance one frame to avoid that issue
+			_core.Citra_RunFrame(_context);
 			OnVideoRefresh();
 		}
 

src/BizHawk.Emulation.Cores/Consoles/Nintendo/BSNES/BsnesApi.cs

@@ -294,6 +294,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.BSNES
 
 		// private int serializedSize;
 
+		public bool AvoidRewind => false;
+
 		public void SaveStateBinary(BinaryWriter writer)
 		{
 			// commented code left for debug purposes; created savestates are native bsnes savestates

src/BizHawk.Emulation.Cores/Consoles/Nintendo/BSNES/BsnesCore.IStatable.cs

@@ -5,6 +5,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.BSNES
 {
 	public partial class BsnesCore : IStatable
 	{
+		public bool AvoidRewind => false;
+
 		public void SaveStateBinary(BinaryWriter writer)
 		{
 			Api.SaveStateBinary(writer);

src/BizHawk.Emulation.Cores/Consoles/Nintendo/GBA/MGBAHawk.IStatable.cs

@@ -9,6 +9,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBA
 	{
 		private byte[] _savebuff = Array.Empty<byte>();
 
+		public bool AvoidRewind => false;
+
 		public void SaveStateBinary(BinaryWriter writer)
 		{
 			if (!LibmGBA.BizStartGetState(Core, out var p, out var size))

src/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawkLink/GBHawkLink.IStatable.cs

@@ -10,6 +10,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawkLink
 		private readonly IStatable _lStates;
 		private readonly IStatable _rStates;
 
+		public bool AvoidRewind => _lStates.AvoidRewind || _rStates.AvoidRewind;
+
 		public void SaveStateBinary(BinaryWriter bw)
 		{
 			_lStates.SaveStateBinary(bw);

src/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawkLink3x/GBHawkLink3x.IStatable.cs

@@ -10,6 +10,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawkLink3x
 		private readonly IStatable _cStates;
 		private readonly IStatable _rStates;
 
+		public bool AvoidRewind => _lStates.AvoidRewind || _cStates.AvoidRewind || _rStates.AvoidRewind;
+
 		public void SaveStateBinary(BinaryWriter bw)
 		{
 			_lStates.SaveStateBinary(bw);

src/BizHawk.Emulation.Cores/Consoles/Nintendo/GBHawkLink4x/GBHawkLink4x.IStatable.cs

@@ -12,6 +12,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.GBHawkLink4x
 		private readonly IStatable _cStates;
 		private readonly IStatable _dStates;
 
+		public bool AvoidRewind => _aStates.AvoidRewind || _bStates.AvoidRewind || _cStates.AvoidRewind || _dStates.AvoidRewind;
+
 		public void SaveStateBinary(BinaryWriter bw)
 		{
 			_aStates.SaveStateBinary(bw);

src/BizHawk.Emulation.Cores/Consoles/Nintendo/Gameboy/Gambatte.IStatable.cs

@@ -11,6 +11,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.Gameboy
 {
 	public partial class Gameboy : IStatable, ITextStatable
 	{
+		public bool AvoidRewind => false;
+
 		public void SaveStateText(TextWriter writer)
 		{
 			var s = SaveState();

src/BizHawk.Emulation.Cores/Consoles/Nintendo/Gameboy/GambatteLink.IStatable.cs

@@ -9,6 +9,20 @@ namespace BizHawk.Emulation.Cores.Nintendo.Gameboy
 {
 	public partial class GambatteLink : ITextStatable
 	{
+		public bool AvoidRewind
+		{
+			get
+			{
+				var ret = false;
+				for (var i = 0; i < _numCores; i++)
+				{
+					ret |= _linkedCores[i].AvoidRewind;
+				}
+
+				return ret;
+			}
+		}
+
 		public void SaveStateText(TextWriter writer)
 		{
 			ser.Serialize(writer, new GBLSerialized(this));

src/BizHawk.Emulation.Cores/Consoles/Nintendo/N64/N64.IStatable.cs

@@ -8,6 +8,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.N64
 {
 	public partial class N64 : IStatable
 	{
+		public bool AvoidRewind => false;
+
 		public void SaveStateBinary(BinaryWriter writer)
 		{
 			byte[] data = SaveStatePrivateBuff;

src/BizHawk.Emulation.Cores/Consoles/Nintendo/QuickNES/QuickNES.IStatable.cs

@@ -6,6 +6,8 @@ namespace BizHawk.Emulation.Cores.Consoles.Nintendo.QuickNES
 {
 	public partial class QuickNES : IStatable
 	{
+		public bool AvoidRewind => false;
+
 		public void SaveStateBinary(BinaryWriter writer)
 		{
 			CheckDisposed();

src/BizHawk.Emulation.Cores/Consoles/Nintendo/SNES/LibsnesApi.cs

@@ -428,6 +428,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.SNES
 			_readonlyFiles.Clear();
 		}
 
+		public bool AvoidRewind => false;
+
 		public void SaveStateBinary(BinaryWriter writer)
 		{
 			_exe.SaveStateBinary(writer);

src/BizHawk.Emulation.Cores/Consoles/Nintendo/SNES/LibsnesCore.IStatable.cs

@@ -5,6 +5,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.SNES
 {
 	public partial class LibsnesCore : IStatable
 	{
+		public bool AvoidRewind => false;
+
 		public void SaveStateBinary(BinaryWriter writer)
 		{
 			Api.SaveStateBinary(writer);

src/BizHawk.Emulation.Cores/Consoles/Nintendo/SameBoy/SameBoy.IStatable.cs

@@ -9,6 +9,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.Sameboy
 	{
 		private readonly byte[] _stateBuf;
 
+		public bool AvoidRewind => false;
+
 		public void SaveStateBinary(BinaryWriter writer)
 		{
 			LibSameboy.sameboy_savestate(SameboyState, _stateBuf);

src/BizHawk.Emulation.Cores/Consoles/Nintendo/SubGBHawk/SubGBHawk.IStatable.cs

@@ -9,6 +9,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.SubGBHawk
 	{
 		private readonly IStatable _GBStatable;
 
+		public bool AvoidRewind => _GBStatable.AvoidRewind;
+
 		public void SaveStateBinary(BinaryWriter bw)
 		{
 			_GBStatable.SaveStateBinary(bw);

src/BizHawk.Emulation.Cores/Consoles/Nintendo/SubNESHawk/SubNESHawk.IStatable.cs

@@ -9,6 +9,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.SubNESHawk
 	{
 		private readonly IStatable _nesStatable;
 
+		public bool AvoidRewind => _nesStatable.AvoidRewind;
+
 		public void SaveStateBinary(BinaryWriter bw)
 		{
 			_nesStatable.SaveStateBinary(bw);

src/BizHawk.Emulation.Cores/Consoles/Sega/GGHawkLink/GGHawkLink.IStatable.cs

@@ -10,6 +10,8 @@ namespace BizHawk.Emulation.Cores.Sega.GGHawkLink
 		private readonly IStatable _lStates;
 		private readonly IStatable _rStates;
 
+		public bool AvoidRewind => _lStates.AvoidRewind || _rStates.AvoidRewind;
+
 		public void SaveStateBinary(BinaryWriter bw)
 		{
 			_lStates.SaveStateBinary(bw);

src/BizHawk.Emulation.Cores/Consoles/Sega/gpgx64/GPGX.IStatable.cs

@@ -5,6 +5,8 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 {
 	public partial class GPGX : IStatable
 	{
+		public bool AvoidRewind => false;
+
 		public void LoadStateBinary(BinaryReader reader)
 		{
 			_elf.LoadStateBinary(reader);

src/BizHawk.Emulation.Cores/Consoles/Sony/PSX/Octoshock.cs

@@ -1038,6 +1038,8 @@ namespace BizHawk.Emulation.Cores.Sony.PSX
 			savebuff = new byte[size];
 		}
 
+		public bool AvoidRewind => false;
+
 		public void SaveStateBinary(BinaryWriter writer)
 		{
 			fixed (byte* psavebuff = savebuff)

src/BizHawk.Emulation.Cores/Consoles/WonderSwan/WonderSwan.IStatable.cs

@@ -59,6 +59,8 @@ namespace BizHawk.Emulation.Cores.WonderSwan
 
 		private byte[] savebuff;
 
+		public bool AvoidRewind => false;
+
 		public void SaveStateBinary(BinaryWriter writer)
 		{
 			if (!BizSwan.bizswan_binstatesave(Core, savebuff, savebuff.Length))

src/BizHawk.Emulation.Cores/Libretro/Libretro.IStatable.cs

@@ -21,6 +21,8 @@ namespace BizHawk.Emulation.Cores.Libretro
 			_stateBuf = new byte[maxSize];
 		}
 
+		public bool AvoidRewind => false;
+
 		public void SaveStateBinary(BinaryWriter writer)
 		{
 			var len = checked((int)_api.retro_serialize_size());

src/BizHawk.Emulation.Cores/Waterbox/NymaCore.Controller.cs

@@ -328,6 +328,8 @@ namespace BizHawk.Emulation.Cores.Waterbox
 
 			private const ulong MAGIC = 9569546739673486731;
 
+			public bool AvoidRewind => false;
+
 			public void SaveStateBinary(BinaryWriter writer)
 			{
 				writer.Write(MAGIC);

src/BizHawk.Emulation.Cores/Waterbox/WaterboxCore.cs

@@ -263,6 +263,8 @@ namespace BizHawk.Emulation.Cores.Waterbox
 		public IInputCallbackSystem InputCallbacks { get; } = new InputCallbackSystem();
 		public virtual ControllerDefinition ControllerDefinition { get; protected set; } = NullController.Instance.Definition;
 
+		public bool AvoidRewind => false;
+
 		public void LoadStateBinary(BinaryReader reader)
 		{
 			using (_exe.EnterExit())

src/BizHawk.Emulation.Cores/Waterbox/WaterboxHost.cs

@@ -342,6 +342,8 @@ namespace BizHawk.Emulation.Cores.Waterbox
 			}
 		}
 
+		public bool AvoidRewind => false;
+
 		public void SaveStateBinary(BinaryWriter bw)
 		{
 			using var writer = new ReadWriteWrapper(bw.BaseStream, false);

src/BizHawk.Tests/Client.Common/Movie/ZwinderStateManagerTests.cs

@@ -575,6 +575,9 @@ namespace BizHawk.Tests.Client.Common.Movie
 		{
 			public int Frame { get; set; }
 			public byte[] PaddingData { get; set; } = Array.Empty<byte>();
+
+			public bool AvoidRewind => false;
+
 			public void LoadStateBinary(BinaryReader reader)
 			{
 				Frame = reader.ReadInt32();