diff --git a/Core/ConfigValues.h b/Core/ConfigValues.h
index e7a6957e5c..7d02b5c960 100644
--- a/Core/ConfigValues.h
+++ b/Core/ConfigValues.h
@@ -128,6 +128,7 @@ enum IOTimingMethods {
 	IOTIMING_FAST = 0,
 	IOTIMING_HOST = 1,
 	IOTIMING_REALISTIC = 2,
+	IOTIMING_UMDSLOWREALISTIC = 3,
 };
 
 enum class AutoLoadSaveState {
diff --git a/Core/HLE/sceIo.cpp b/Core/HLE/sceIo.cpp
index f04c8175bd..4fa5826a6d 100644
--- a/Core/HLE/sceIo.cpp
+++ b/Core/HLE/sceIo.cpp
@@ -341,7 +341,7 @@ static void IoAsyncCleanupThread(int fd) {
 }
 
 static int GetIOTimingMethod() {
-	if (PSP_CoreParameter().compat.flags().ForceUMDDelay) {
+	if (PSP_CoreParameter().compat.flags().ForceUMDDelay || PSP_CoreParameter().compat.flags().ForceUMDReadSpeed || g_Config.iIOTimingMethod == IOTIMING_UMDSLOWREALISTIC) {
 		return IOTIMING_REALISTIC;
 	} else {
 		return g_Config.iIOTimingMethod;
@@ -1586,7 +1586,7 @@ static u32 sceIoOpen(const char *filename, int flags, int mode) {
 		// UMD: Speed varies from 1-6ms.
 		// Card: Path depth matters, but typically between 10-13ms on a standard Pro Duo.
 		int delay;
-		if (PSP_CoreParameter().compat.flags().ForceUMDReadSpeed || g_Config.iIOTimingMethod == 3) {
+		if (PSP_CoreParameter().compat.flags().ForceUMDReadSpeed || g_Config.iIOTimingMethod == IOTIMING_UMDSLOWREALISTIC) {
 			delay = 500000;
 		}
 		else {
diff --git a/libretro/libretro.cpp b/libretro/libretro.cpp
index c5b4807750..de6792012f 100644
--- a/libretro/libretro.cpp
+++ b/libretro/libretro.cpp
@@ -523,6 +523,8 @@ static void check_variables(CoreParameter &coreParam)
          g_Config.iIOTimingMethod = IOTIMING_HOST;
       else if (!strcmp(var.value, "Simulate UMD delays"))
          g_Config.iIOTimingMethod = IOTIMING_REALISTIC;
+      else if (!strcmp(var.value, "Simulate UMD slow reading speed"))
+         g_Config.iIOTimingMethod = IOTIMING_UMDSLOWREALISTIC;
    }
 
    var.key = "ppsspp_force_lag_sync";