diff --git a/Core/HLE/HLE.cpp b/Core/HLE/HLE.cpp
index 4930f92723..4dd0d92e71 100644
--- a/Core/HLE/HLE.cpp
+++ b/Core/HLE/HLE.cpp
@@ -65,7 +65,7 @@ void hleDelayResultFinish(u64 userdata, int cycleslate)
 	u32 error;
 	SceUID threadID = (SceUID) userdata;
 	SceUID verify = __KernelGetWaitID(threadID, WAITTYPE_DELAY, error);
-	SceUID result = __KernelGetWaitValue(threadID, error);
+	u64 result = (userdata ^ threadID) | __KernelGetWaitValue(threadID, error);
 
 	if (error == 0 && verify == 1)
 		__KernelResumeThreadFromWait(threadID, result);
@@ -335,6 +335,14 @@ u32 hleDelayResult(u32 result, const char *reason, int usec)
 	return result;
 }
 
+u64 hleDelayResult(u64 result, const char *reason, int usec)
+{
+	u64 param = (result & 0xFFFFFFFF00000000) | __KernelGetCurThread();
+	CoreTiming::ScheduleEvent(usToCycles(usec), delayedResultEvent, param);
+	__KernelWaitCurThread(WAITTYPE_DELAY, 1, (u32) result, 0, false, reason);
+	return result;
+}
+
 void hleEatMicro(int usec)
 {
 	// Maybe this should Idle, at least for larger delays?  Could that cause issues?
diff --git a/Core/HLE/HLE.h b/Core/HLE/HLE.h
index 2618eefcfb..2f51492e1b 100644
--- a/Core/HLE/HLE.h
+++ b/Core/HLE/HLE.h
@@ -89,8 +89,19 @@ void hleDebugBreak();
 
 // Delays the result for usec microseconds, allowing other threads to run during this time.
 u32 hleDelayResult(u32 result, const char *reason, int usec);
+u64 hleDelayResult(u64 result, const char *reason, int usec);
 void hleEatMicro(int usec);
 
+inline int hleDelayResult(int result, const char *reason, int usec)
+{
+	return hleDelayResult((u32) result, reason, usec);
+}
+
+inline s64 hleDelayResult(s64 result, const char *reason, int usec)
+{
+	return hleDelayResult((u64) result, reason, usec);
+}
+
 void HLEInit();
 void HLEDoState(PointerWrap &p);
 void HLEShutdown();
diff --git a/Core/HLE/sceIo.cpp b/Core/HLE/sceIo.cpp
index 79799ca9cc..5ea70936f3 100644
--- a/Core/HLE/sceIo.cpp
+++ b/Core/HLE/sceIo.cpp
@@ -627,7 +627,8 @@ s64 sceIoLseek(int id, s64 offset, int whence) {
 	s64 result = __IoLseek(id, offset, whence);
 	if (result >= 0) {
 		DEBUG_LOG(HLE, "%lli = sceIoLseek(%d, %llx, %i)", result, id, offset, whence);
-		return result;
+		// Educated guess at timing.
+		return hleDelayResult(result, "io seek", 100);
 	} else {
 		ERROR_LOG(HLE, "sceIoLseek(%d, %llx, %i) - ERROR: invalid file", id, offset, whence);
 		return result;
@@ -638,7 +639,8 @@ u32 sceIoLseek32(int id, int offset, int whence) {
 	s32 result = (s32) __IoLseek(id, offset, whence);
 	if (result >= 0) {
 		DEBUG_LOG(HLE, "%lli = sceIoLseek(%d, %x, %i)", result, id, offset, whence);
-		return result;
+		// Educated guess at timing.
+		return hleDelayResult(result, "io seek", 100);
 	} else {
 		ERROR_LOG(HLE, "sceIoLseek(%d, %x, %i) - ERROR: invalid file", id, offset, whence);
 		return result;
diff --git a/Core/HLE/sceKernelThread.cpp b/Core/HLE/sceKernelThread.cpp
index b92f792eef..23e2bb5d95 100644
--- a/Core/HLE/sceKernelThread.cpp
+++ b/Core/HLE/sceKernelThread.cpp
@@ -372,6 +372,7 @@ public:
 
 	ActionAfterMipsCall *getRunningCallbackAction();
 	void setReturnValue(u32 retval);
+	void setReturnValue(u64 retval);
 	void resumeFromWait();
 	bool isWaitingFor(WaitType type, int id);
 	int getWaitID(WaitType type);
@@ -588,6 +589,12 @@ void MipsCall::setReturnValue(u32 value)
 	savedV0 = value;
 }
 
+void MipsCall::setReturnValue(u64 value)
+{
+	savedV0 = value & 0xFFFFFFFF;
+	savedV1 = (value >> 32) & 0xFFFFFFFF;
+}
+
 // TODO: Should move to this wrapper so we can keep the current thread as a SceUID instead
 // of a dangerous raw pointer.
 Thread *__GetCurrentThread() {
@@ -1058,7 +1065,24 @@ u32 __KernelResumeThreadFromWait(SceUID threadID)
 	}
 }
 
-u32 __KernelResumeThreadFromWait(SceUID threadID, int retval)
+u32 __KernelResumeThreadFromWait(SceUID threadID, u32 retval)
+{
+	u32 error;
+	Thread *t = kernelObjects.Get<Thread>(threadID, error);
+	if (t)
+	{
+		t->resumeFromWait();
+		t->setReturnValue(retval);
+		return 0;
+	}
+	else
+	{
+		ERROR_LOG(HLE, "__KernelResumeThreadFromWait(%d): bad thread: %08x", threadID, error);
+		return error;
+	}
+}
+
+u32 __KernelResumeThreadFromWait(SceUID threadID, u64 retval)
 {
 	u32 error;
 	Thread *t = kernelObjects.Get<Thread>(threadID, error);
@@ -1091,7 +1115,7 @@ bool __KernelTriggerWait(WaitType type, int id, bool useRetVal, int retVal, cons
 			// This thread was waiting for the triggered object.
 			t->resumeFromWait();
 			if (useRetVal)
-				t->setReturnValue(retVal);
+				t->setReturnValue((u32)retVal);
 			doneAnything = true;
 		}
 	}
@@ -2279,6 +2303,27 @@ void Thread::setReturnValue(u32 retval)
 	}
 }
 
+void Thread::setReturnValue(u64 retval)
+{
+	if (this->GetUID() == currentThread) {
+		if (g_inCbCount) {
+			u32 callId = this->currentCallbackId;
+			MipsCall *call = mipsCalls.get(callId);
+			if (call) {
+				call->setReturnValue(retval);
+			} else {
+				ERROR_LOG(HLE, "Failed to inject return value %08llx in thread", retval);
+			}
+		} else {
+			currentMIPS->r[2] = retval & 0xFFFFFFFF;
+			currentMIPS->r[3] = (retval >> 32) & 0xFFFFFFFF;
+		}
+	} else {
+		context.r[2] = retval & 0xFFFFFFFF;
+		context.r[3] = (retval >> 32) & 0xFFFFFFFF;
+	}
+}
+
 void Thread::resumeFromWait()
 {
 	// Do we need to "inject" it?
diff --git a/Core/HLE/sceKernelThread.h b/Core/HLE/sceKernelThread.h
index 88ed9c44d9..07883a7570 100644
--- a/Core/HLE/sceKernelThread.h
+++ b/Core/HLE/sceKernelThread.h
@@ -127,7 +127,18 @@ void __KernelLoadContext(ThreadContext *ctx);
 bool __KernelTriggerWait(WaitType type, int id, const char *reason, bool dontSwitch = false);
 bool __KernelTriggerWait(WaitType type, int id, int retVal, const char *reason, bool dontSwitch);
 u32 __KernelResumeThreadFromWait(SceUID threadID); // can return an error value
-u32 __KernelResumeThreadFromWait(SceUID threadID, int retval);
+u32 __KernelResumeThreadFromWait(SceUID threadID, u32 retval);
+u32 __KernelResumeThreadFromWait(SceUID threadID, u64 retval);
+
+inline u32 __KernelResumeThreadFromWait(SceUID threadID, int retval)
+{
+	return __KernelResumeThreadFromWait(threadID, (u32)retval);
+}
+
+inline u32 __KernelResumeThreadFromWait(SceUID threadID, s64 retval)
+{
+	return __KernelResumeThreadFromWait(threadID, (u64)retval);
+}
 
 u32 __KernelGetWaitValue(SceUID threadID, u32 &error);
 u32 __KernelGetWaitTimeoutPtr(SceUID threadID, u32 &error);
@@ -231,6 +242,15 @@ struct MipsCall {
 
 	void DoState(PointerWrap &p);
 	void setReturnValue(u32 value);
+	void setReturnValue(u64 value);
+	inline void setReturnValue(int value)
+	{
+		setReturnValue((u32)value);
+	}
+	inline void setReturnValue(s64 value)
+	{
+		setReturnValue((u64)value);
+	}
 };
 
 class Action