Add RR hack, not tested much yet, but better than nothing.

Core/Compatibility.cpp

@@ -51,6 +51,7 @@ void Compatibility::CheckSettings(IniFile &iniFile, const std::string &gameID) {
 	CheckSetting(iniFile, gameID, "ClearToRAM", &flags_.ClearToRAM);
 	CheckSetting(iniFile, gameID, "Force04154000Download", &flags_.Force04154000Download);
 	CheckSetting(iniFile, gameID, "DrawSyncEatCycles", &flags_.DrawSyncEatCycles);
+	CheckSetting(iniFile, gameID, "DelayDelayThreadHack", &flags_.DelayDelayThreadHack);
 	CheckSetting(iniFile, gameID, "FakeMipmapChange", &flags_.FakeMipmapChange);
 	CheckSetting(iniFile, gameID, "HackFixVideo", &flags_.HackFixVideo);
 	CheckSetting(iniFile, gameID, "HackFixHangs", &flags_.HackFixHangs);

Core/Compatibility.h

@@ -51,6 +51,7 @@ struct CompatFlags {
 	bool ClearToRAM;
 	bool Force04154000Download;
 	bool DrawSyncEatCycles;
+	bool DelayDelayThreadHack;
 	bool FakeMipmapChange;
 	bool RequireBufferedRendering;
 	bool RequireBlockTransfer;

Core/HLE/sceKernelThread.cpp

@@ -32,6 +32,7 @@
 #include "Core/CoreTiming.h"
 #include "Core/MemMapHelpers.h"
 #include "Core/Reporting.h"
+#include "Core/System.h"
 #include "Common/ChunkFile.h"
 
 #include "Core/HLE/sceAudio.h"
@@ -2463,7 +2464,12 @@ int sceKernelDelayThread(u32 usec) {
 	s64 delayUs = __KernelDelayThreadUs(usec);
 	__KernelScheduleWakeup(curThread, delayUs);
 	__KernelWaitCurThread(WAITTYPE_DELAY, curThread, 0, 0, false, "thread delayed");
-	return hleLogSuccessI(SCEKERNEL, 0, "delaying %lld usecs", delayUs);
+	int result = 0;
+	if (PSP_CoreParameter().compat.flags().DelayDelayThreadHack)
+		result = hleDelayResult(hleLogSuccessI(SCEKERNEL, 0, "delaying %lld usecs", delayUs), "hack", 6000);
+	else
+		result = hleLogSuccessI(SCEKERNEL, 0, "delaying %lld usecs", delayUs);
+	return result;
 }
 
 int sceKernelDelaySysClockThreadCB(u32 sysclockAddr) {

assets/compat.ini

@@ -176,6 +176,17 @@ UCJS18036 = true
 UCAS40292 = true
 UCJS18053 = true
 
+[DelayDelayThreadHack]
+# Dumb hack specially for Resistance Retribution
+# Probably the game would work by delaying in any other place that affects FPS
+# ...oh well it's a hackish playground branch, didn't even tested this much yet;p.
+# At least it's not as bad with dropping FPS like reducing cpu clock,
+# mostly drops it to 40-50 fps in places that would otherwise crash.
+UCJS10090 = true
+NPJG00018 = true
+UCUS98668 = true
+UCES01184 = true
+
 [FakeMipmapChange]
 # This hacks separates each mipmap to independent textures to display wrong-size mipmaps.
 # For example this requires games like Tactics Ogre(Japanese) to display multi bytes fonts stored in mipmaps.
@@ -268,6 +279,10 @@ ULKS46009 = true
 ULJM05160 = true
 ULES00042 = true
 ULJM05363 = true
+# DTM Race Driver 3 / TOCA Race Driver 3: Challenge / V8 Supercars 3
+ULES00613 = true
+ULES00614 = true
+ULES00615 = true
 # might also be useful for Outrun and Brave Story?
 
 [RequireBufferedRendering]