diff --git a/Core/HLE/sceKernelModule.cpp b/Core/HLE/sceKernelModule.cpp
index f542354805..f74a78e0d0 100644
--- a/Core/HLE/sceKernelModule.cpp
+++ b/Core/HLE/sceKernelModule.cpp
@@ -1147,7 +1147,6 @@ static int gzipDecompress(u8 *OutBuffer, int OutBufferLength, u8 *InBuffer) {
 static PSPModule *__KernelLoadELFFromPtr(const u8 *ptr, size_t elfSize, u32 loadAddress, bool fromTop, std::string *error_string, u32 *magic, u32 &error) {
 	u32 crc = crc32(0, Z_NULL, 0);
 	crc = crc32(crc, ptr, elfSize);
-	const std::string crcstring = int2hexstr(crc);
 	PSPModule *module = new PSPModule();
 	kernelObjects.Create(module);
 	loadedModules.insert(module->GetUID());
@@ -1174,14 +1173,14 @@ static PSPModule *__KernelLoadELFFromPtr(const u8 *ptr, size_t elfSize, u32 load
 
 		if (IsHLEVersionedModule(head->modname)) {
 			int ver = (head->module_ver_hi << 8) | head->module_ver_lo;
-			INFO_LOG(SCEMODULE, "Loading module %s with version %04x, devkit %08x, crc %s", head->modname, ver, head->devkitversion, crcstring.c_str());
+			INFO_LOG(SCEMODULE, "Loading module %s with version %04x, devkit %08x, crc %x", head->modname, ver, head->devkitversion, crc);
 			reportedModule = true;
 
 			if (!strcmp(head->modname, "sceMpeg_library")) {
-				__MpegLoadModule(ver, crcstring);
+				__MpegLoadModule(ver, crc);
 			}
 			if (!strcmp(head->modname, "scePsmfP_library") || !strcmp(head->modname, "scePsmfPlayer")) {
-				__PsmfPlayerLoadModule(head->devkitversion, crcstring);
+				__PsmfPlayerLoadModule(head->devkitversion, crc);
 			}
 		}
 
@@ -1614,10 +1613,10 @@ static PSPModule *__KernelLoadELFFromPtr(const u8 *ptr, size_t elfSize, u32 load
 		INFO_LOG(SCEMODULE, "Loading module %s with version %04x, devkit %08x", modinfo->name, modinfo->moduleVersion, devkitVersion);
 
 		if (!strcmp(modinfo->name, "sceMpeg_library")) {
-			__MpegLoadModule(modinfo->moduleVersion, crcstring);
+			__MpegLoadModule(modinfo->moduleVersion, crc);
 		}
 		if (!strcmp(modinfo->name, "scePsmfP_library") || !strcmp(modinfo->name, "scePsmfPlayer")) {
-			__PsmfPlayerLoadModule(devkitVersion, crcstring);
+			__PsmfPlayerLoadModule(devkitVersion, crc);
 		}
 	}
 
diff --git a/Core/HLE/sceMpeg.cpp b/Core/HLE/sceMpeg.cpp
index cb9fd9aba1..929e782d0c 100644
--- a/Core/HLE/sceMpeg.cpp
+++ b/Core/HLE/sceMpeg.cpp
@@ -259,7 +259,7 @@ struct MpegContext {
 
 static bool isMpegInit;
 static int mpegLibVersion = 0;
-static std::string mpegLibCrcstring = "null";
+static u32 mpegLibCrc = 0;
 static u32 streamIdGen;
 static int actionPostPut;
 static std::map<u32, MpegContext *> mpegMap;
@@ -424,10 +424,10 @@ void __MpegDoState(PointerWrap &p) {
 			Do(p, ringbufferPutPacketsAdded);
 		} 
 		if (s < 4) {
-			mpegLibCrcstring = "null";
+			mpegLibCrc = 0;
 		}
 		else {
-			Do(p, mpegLibCrcstring);
+			Do(p, mpegLibCrc);
 		}
 
 		Do(p, streamIdGen);
@@ -448,9 +448,9 @@ void __MpegShutdown() {
 	mpegMap.clear();
 }
 
-void __MpegLoadModule(int version,std::string crcstr) {
+void __MpegLoadModule(int version,u32 crc) {
 	mpegLibVersion = version;
-	mpegLibCrcstring = crcstr;
+	mpegLibCrc = crc;
 }
 
 static u32 sceMpegInit() {
@@ -459,7 +459,7 @@ static u32 sceMpegInit() {
 		// TODO: Need to properly hook module load/unload for this to work right.
 		//return ERROR_MPEG_ALREADY_INIT;
 	} else {
-		INFO_LOG(ME, "sceMpegInit(), mpegLibVersion 0x%0x, mpegLibcrc %s", mpegLibVersion, mpegLibCrcstring.c_str());
+		INFO_LOG(ME, "sceMpegInit(), mpegLibVersion 0x%0x, mpegLibcrc %x", mpegLibVersion, mpegLibCrc);
 	}
 	isMpegInit = true;
 	return hleDelayResult(0, "mpeg init", 750);
diff --git a/Core/HLE/sceMpeg.h b/Core/HLE/sceMpeg.h
index 538c60c9a8..925a2b005b 100644
--- a/Core/HLE/sceMpeg.h
+++ b/Core/HLE/sceMpeg.h
@@ -79,7 +79,7 @@ void __MpegInit();
 void __MpegDoState(PointerWrap &p);
 void __MpegShutdown();
 
-void __MpegLoadModule(int version,std::string crcstr);
+void __MpegLoadModule(int version,u32 crc);
 
 void Register_sceMpeg();
 
diff --git a/Core/HLE/scePsmf.cpp b/Core/HLE/scePsmf.cpp
index 9b81e83a96..cf01260f2c 100644
--- a/Core/HLE/scePsmf.cpp
+++ b/Core/HLE/scePsmf.cpp
@@ -59,7 +59,7 @@ static const int audioSamplesBytes = audioSamples * 4;
 static int videoPixelMode = GE_CMODE_32BIT_ABGR8888;
 static int videoLoopStatus = PSMF_PLAYER_CONFIG_NO_LOOP;
 static int psmfPlayerLibVersion = 0;
-static std::string psmfPlayerLibcrcstring = "null";
+static u32 psmfPlayerLibcrc = 0;
 
 int eventPsmfPlayerStatusChange = -1;
 
@@ -697,9 +697,9 @@ void __PsmfInit() {
 	eventPsmfPlayerStatusChange = CoreTiming::RegisterEvent("PsmfPlayerStatusChange", &__PsmfPlayerStatusChange);
 }
 
-void __PsmfPlayerLoadModule(int devkitVersion, std::string crcstr) {
+void __PsmfPlayerLoadModule(int devkitVersion, u32 crc) {
 	psmfPlayerLibVersion = devkitVersion;
-	psmfPlayerLibcrcstring = crcstr;
+	psmfPlayerLibcrc = crc;
 }
 
 void __PsmfDoState(PointerWrap &p) {
@@ -725,9 +725,9 @@ void __PsmfPlayerDoState(PointerWrap &p) {
 	}
 	CoreTiming::RestoreRegisterEvent(eventPsmfPlayerStatusChange, "PsmfPlayerStatusChangeEvent", &__PsmfPlayerStatusChange);
 	if (s < 3) {
-		psmfPlayerLibcrcstring = "null";
+		psmfPlayerLibcrc = 0;
 	} else {
-		Do(p, psmfPlayerLibcrcstring);
+		Do(p, psmfPlayerLibcrc);
 	}
 	if (s < 2) {
 		// Assume the latest, which is what we were emulating before.
@@ -1164,7 +1164,7 @@ static int scePsmfPlayerCreate(u32 psmfPlayer, u32 dataPtr) {
 
 	int delayUs = 20000;
 	DelayPsmfStateChange(psmfPlayer, PSMF_PLAYER_STATUS_INIT, delayUs);
-	INFO_LOG(ME, "psmfplayer create, psmfPlayerLibVersion 0x%0x, psmfPlayerLibcrcstring %s", psmfPlayerLibVersion, psmfPlayerLibcrcstring.c_str());
+	INFO_LOG(ME, "psmfplayer create, psmfPlayerLibVersion 0x%0x, psmfPlayerLibcrc %x", psmfPlayerLibVersion, psmfPlayerLibcrc);
 	return hleDelayResult(0, "player create", delayUs);	
 }
 
diff --git a/Core/HLE/scePsmf.h b/Core/HLE/scePsmf.h
index 8e201adade..ae143fce04 100644
--- a/Core/HLE/scePsmf.h
+++ b/Core/HLE/scePsmf.h
@@ -21,7 +21,7 @@ void Register_scePsmf();
 void Register_scePsmfPlayer();
 
 void __PsmfInit();
-void __PsmfPlayerLoadModule(int devkitVersion,std::string crcstr);
+void __PsmfPlayerLoadModule(int devkitVersion,u32 crc);
 void __PsmfDoState(PointerWrap &p);
 void __PsmfPlayerDoState(PointerWrap &p);
 void __PsmfShutdown();
diff --git a/UI/GameScreen.cpp b/UI/GameScreen.cpp
index 89490193df..edf519f46b 100644
--- a/UI/GameScreen.cpp
+++ b/UI/GameScreen.cpp
@@ -44,7 +44,6 @@
 #include "UI/MainScreen.h"
 #include "UI/BackgroundAudio.h"
 #include "Core/Reporting.h"
-#include <sstream>
 
 GameScreen::GameScreen(const Path &gamePath) : UIDialogScreenWithGameBackground(gamePath) {
 	g_BackgroundAudio.SetGame(gamePath);
@@ -56,11 +55,12 @@ GameScreen::~GameScreen() {
 	}
 }
 
-const char* int2hexstr(const int a) {
-	std::stringstream stream;
-	stream << std::hex << a;
-	auto s = stream.str();
-	return s.c_str();
+template <typename I> std::string int2hexstr(I w, size_t hex_len = sizeof(I) << 1) {
+	static const char* digits = "0123456789ABCDEF";
+	std::string rc(hex_len, '0');
+	for (size_t i = 0, j = (hex_len - 1) * 4; i < hex_len; ++i, j -= 4)
+		rc[i] = digits[(w >> j) & 0x0f];
+	return rc;
 }
 
 void GameScreen::update() {
diff --git a/UI/GameScreen.h b/UI/GameScreen.h
index 43671ec272..cff0c48366 100644
--- a/UI/GameScreen.h
+++ b/UI/GameScreen.h
@@ -29,8 +29,6 @@
 // Uses GameInfoCache heavily to implement the functionality.
 // Should possibly merge this with the PauseScreen.
 
-const char* int2hexstr(const int a);
-
 class GameScreen : public UIDialogScreenWithGameBackground {
 public:
 	GameScreen(const Path &gamePath);