diff --git a/src/backend/core/mmio/PIF.cpp b/src/backend/core/mmio/PIF.cpp
index 0b6728bd..7d86579d 100644
--- a/src/backend/core/mmio/PIF.cpp
+++ b/src/backend/core/mmio/PIF.cpp
@@ -10,10 +10,17 @@
 #define MEMPAK_SIZE 32768
 
 namespace n64 {
-void PIF::LoadMempak(fs::path path) {
-  if (mempak)
-    free(mempak);
+PIF::PIF() {
   mempak = (u8*)calloc(MEMPAK_SIZE, 1);
+}
+
+void PIF::Reset() {
+  memset(joybusDevices, 0, sizeof(JoybusDevice) * 6);
+  memset(bootrom, 0, PIF_BOOTROM_SIZE);
+  memset(ram, 0, PIF_RAM_SIZE);
+}
+
+void PIF::LoadMempak(fs::path path) {
   mempakPath = path.replace_extension(".mempak").string();
   FILE* f = fopen(mempakPath.c_str(), "rb");
   if (!f) {
@@ -79,11 +86,15 @@ void PIF::LoadEeprom(SaveType saveType, fs::path path) {
 
 PIF::~PIF() {
   FILE* f = fopen(mempakPath.c_str(), "wb");
-  fwrite(mempak, 1, MEMPAK_SIZE, f);
-  fclose(f);
+  if(f) {
+    fwrite(mempak, 1, MEMPAK_SIZE, f);
+    fclose(f);
+  }
   f = fopen(eepromPath.c_str(), "wb");
-  fwrite(eeprom, 1, eepromSize, f);
-  fclose(f);
+  if(f) {
+    fwrite(eeprom, 1, eepromSize, f);
+    fclose(f);
+  }
 }
 
 enum CMDIndexes {
diff --git a/src/backend/core/mmio/PIF.hpp b/src/backend/core/mmio/PIF.hpp
index f290027e..af8ad6fc 100644
--- a/src/backend/core/mmio/PIF.hpp
+++ b/src/backend/core/mmio/PIF.hpp
@@ -91,7 +91,9 @@ enum CICType {
 struct CartInfo;
 
 struct PIF {
+  PIF();
   ~PIF();
+  void Reset();
   void LoadMempak(fs::path);
   void LoadEeprom(SaveType, fs::path);
   void ProcessCommands(Mem&);
@@ -115,13 +117,13 @@ struct PIF {
   std::string mempakPath{}, eepromPath{};
   size_t eepromSize{};
 
-  u8 Read(u32 addr) {
+  FORCE_INLINE u8 Read(u32 addr) {
     addr &= 0x7FF;
     if(addr < 0x7c0) return bootrom[addr];
     return ram[addr & PIF_RAM_DSIZE];
   }
 
-  void Write(u32 addr, u8 val) {
+  FORCE_INLINE void Write(u32 addr, u8 val) {
     addr &= 0x7FF;
     if(addr < 0x7c0) return;
     ram[addr & PIF_RAM_DSIZE] = val;
diff --git a/src/backend/core/mmio/SI.cpp b/src/backend/core/mmio/SI.cpp
index 2e3c5365..e60efa2f 100644
--- a/src/backend/core/mmio/SI.cpp
+++ b/src/backend/core/mmio/SI.cpp
@@ -11,9 +11,7 @@ void SI::Reset() {
   status.raw = 0;
   dramAddr = 0;
   pifAddr = 0;
-  memset(&pif.joybusDevices, 0, sizeof(JoybusDevice) * 6);
-  memset(&pif.bootrom, 0, PIF_BOOTROM_SIZE);
-  memset(&pif.ram, 0, PIF_RAM_SIZE);
+  pif.Reset();
 }
 
 auto SI::Read(MI& mi, u32 addr) const -> u32 {