diff --git a/Makefile b/Makefile
index 115d4f8..ac40455 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ INCLUDE =include
 _HX_FEAT?= -DFIXED_ROW_SIZE=24
 
 CXXFLAGS?= -pipe -O3 -march=native
-CXXFLAGS+= -flto -felide-constructors -fgraphite -fno-strict-aliasing
+CXXFLAGS+= -flto -felide-constructors -fgraphite -fno-strict-aliasing -fno-exceptions -fomit-frame-pointer -fmerge-all-constants -fmodulo-sched -funswitch-loops -fsplit-loops
 CXXFLAGS+= -Wall -pedantic --std=gnu++20 $(addprefix -I,$(INCLUDE))
 LDFLAGS?= -O3 -flto
 LDFLAGS+= -lfmt
@@ -25,7 +25,7 @@ PROF_FLAGS = -fprofile-generate
 ###
 
 .PHONY: all
-all: dirs $(PROJ)
+all: | dirs $(PROJ)
 
 dirs:
 	@mkdir -p obj/src
@@ -44,7 +44,7 @@ $(PROJ): $(OBJ)
 pgo-generate: $(PGO_OBJ)
 	$(CXX) $^ $(CXXFLAGS) $(PROF_FLAGS) -o $@ $(LDFLAGS) $(PROF_FLAGS)
 
-pgo-profile: dirs pgo-generate
+pgo-profile: pgo-generate
 	for i in {1..$(PGO_ITERATIONS)}; do \
 		dd if=/dev/urandom of=./pgo-test bs=1024 count=$(PGO_DATASET_SIZE) >> /dev/null 2>&1; \
 		printf "\rIteration $$i / $(PGO_ITERATIONS)"; \
@@ -60,7 +60,9 @@ pgo-use: PROF_FLAGS = -fprofile-use -lgcov
 pgo-use: $(PGO_OBJ)
 	$(CXX) $^ $(CXXFLAGS) $(PROF_FLAGS) -o $@ $(LDFLAGS) $(PROF_FLAGS)
 
-$(PROJ)-pgo: dirs pgo-profile pgo-use
+$(PROJ)-pgo: | dirs pgo-profile
+	find ./profile -name \*.o -exec rm {} +
+	$(MAKE) pgo-use
 	mv pgo-use $@
 	strip $@
 
diff --git a/include/memory-map.hpp b/include/memory-map.hpp
index 04ab367..1ffc82e 100644
--- a/include/memory-map.hpp
+++ b/include/memory-map.hpp
@@ -25,12 +25,12 @@ namespace hv
 
     inline byte& operator[](std::size_t index)
     {
-      if (index>=size) throw "tried to index out of bounds of map";
+      if (index>=size) std::terminate();
       return ((byte*)block0)[index];
     }
     inline const byte& operator[](std::size_t index) const
     {
-      if (index>=size) throw "tried to index out of bounds of map";
+      if (index>=size) std::terminate();
       return ((byte*)block0)[index];
     }
 
@@ -64,7 +64,7 @@ namespace hv
 
     inline const byte& operator[](std::size_t index) const
     {
-      if (index>=size) throw "tried to index out of bounds of map";
+      if (index>=size) std::terminate();
       return ((byte*)block0)[index];
     }
     
diff --git a/src/memory-map.cpp b/src/memory-map.cpp
index 40fac33..d6fd0ba 100644
--- a/src/memory-map.cpp
+++ b/src/memory-map.cpp
@@ -9,12 +9,12 @@ namespace hv
   memory_map::memory_map(std::uint64_t size, int&& fd) noexcept
     : is_cow(false), size(size), fd(fd), block0(mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0))
   {
-    if(!block0) throw "memory_map failed";
+    if(!block0) std::terminate();
   }
   memory_map::memory_map(std::uint64_t size, int&& fd, bool _cow) noexcept
     : is_cow(true), size(size), fd(fd), block0(mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0))
   {
-    if(!block0) throw "memory_map::cow failed";
+    if(!block0) std::terminate();
   }
   memory_map::memory_map(std::uint64_t size, const char* file) noexcept
     : memory_map(size, open(file, O_RDWR)) {}