diff --git a/CMakeLists.txt b/CMakeLists.txt
index ae8a7e3..a40e42e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -107,12 +107,14 @@ if(CMAKE_BUILD_TYPE STREQUAL "Debug")
 
     target_compile_options(${PROJECT_NAME} PRIVATE
         -fsanitize=address
+        #-fsanitize=thread
         -fno-omit-frame-pointer   
         -g                        
     )
 
     target_link_options(${PROJECT_NAME} PRIVATE
         -fsanitize=address
+        #-fsanitize=thread
     )
 
     target_compile_definitions(${PROJECT_NAME} PRIVATE DEBUG_MODE)
diff --git a/include/Cubed/tools/cubed_random.hpp b/include/Cubed/tools/cubed_random.hpp
index 68f3ba3..3d7e6f8 100644
--- a/include/Cubed/tools/cubed_random.hpp
+++ b/include/Cubed/tools/cubed_random.hpp
@@ -4,8 +4,8 @@ namespace Cubed {
 
 class Random {
 public:
-    Random();
-
+    static unsigned get_base_seed();
+    static unsigned get_thread_seed();
     static Random& get();
 
     bool random_bool(double probability);
@@ -13,6 +13,7 @@ public:
     unsigned seed();
 
 private:
+    Random();
     unsigned int m_seed = 0;
     std::mt19937 m_engine;
 };
diff --git a/include/Cubed/tools/log.hpp b/include/Cubed/tools/log.hpp
index 8530654..60607b6 100644
--- a/include/Cubed/tools/log.hpp
+++ b/include/Cubed/tools/log.hpp
@@ -1,4 +1,5 @@
 #pragma once
+#include <syncstream>
 #include <iostream>
 #include <chrono>
 #include <format>
@@ -21,11 +22,11 @@ namespace Logger {
                         (std::chrono::system_clock::now());
         
         std::string msg = std::vformat(fmt.get(), std::make_format_args(args...));
-        std::cout << "\033[1;32m" 
+        std::osyncstream(std::cout) << "\033[1;32m" 
                   << std::format("[INFO][{:%Y-%m-%d %H:%M:%S}]", now_time) 
                   << msg 
                   << "\033[0m" 
-                  << std::endl;
+                  << "\n";
     }
 
     template<typename... Args>
@@ -34,11 +35,11 @@ namespace Logger {
                         time_point_cast<std::chrono::seconds> 
                         (std::chrono::system_clock::now());
         std::string msg = std::vformat(fmt.get(), std::make_format_args(args...));
-        std::cerr << "\033[1;31m" 
+        std::osyncstream(std::cerr) << "\033[1;31m" 
                   << std::format("[ERROR][{:%Y-%m-%d %H:%M:%S}]", now_time) 
                   << msg 
                   << "\033[0m" 
-                  << std::endl;
+                  << "\n";
     
     }
 
@@ -48,11 +49,11 @@ namespace Logger {
                         time_point_cast<std::chrono::seconds> 
                         (std::chrono::system_clock::now());
         std::string msg = std::vformat(fmt.get(), std::make_format_args(args...));
-        std::cout << "\033[1;33m" 
+        std::osyncstream(std::cout) << "\033[1;33m" 
                   << std::format("[WARN][{:%Y-%m-%d %H:%M:%S}]", now_time) 
                   << msg 
                   << "\033[0m" 
-                  << std::endl;
+                  << "\n";
     }
 
     template<typename... Args>
@@ -63,7 +64,7 @@ namespace Logger {
         std::string msg = std::vformat(fmt.get(), std::make_format_args(args...));
         switch (level) {
             case Logger::Level::TRACE:
-                std::cout << "\033[1;34m"
+                std::osyncstream(std::cout) << "\033[1;34m"
                   << std::format("[TRACE][{:%Y-%m-%d %H:%M:%S}]", now_time)
                   << "[" << loc.file_name() << ":" << loc.line() << "]"
                   << "[" << loc.function_name() << "]"
@@ -72,20 +73,20 @@ namespace Logger {
                   << "\n";
                 break;
             case Logger::Level::DEBUG:
-                std::cout << "\033[1;34m"
+                std::osyncstream(std::cout) << "\033[1;34m"
                   << std::format("[DEBUG][{:%Y-%m-%d %H:%M:%S}]", now_time)
                   << msg
                   << "\033[0m"
                   << "\n";
                 break;
             case Logger::Level::INFO:
-                info(fmt, std::forward<Args...>(args)...);
+                info(fmt, std::forward<Args>(args)...);
                 break;
             case Logger::Level::WARN:
-                warn(fmt, std::forward<Args...>(args)...);
+                warn(fmt, std::forward<Args>(args)...);
                 break;
             case Logger::Level::ERROR:
-                error(fmt, std::forward<Args...>(args)...);
+                error(fmt, std::forward<Args>(args)...);
                 break;
             
         }
diff --git a/src/gameplay/world.cpp b/src/gameplay/world.cpp
index dc7deb5..e36e090 100644
--- a/src/gameplay/world.cpp
+++ b/src/gameplay/world.cpp
@@ -106,11 +106,22 @@ void World::init_world() {
         chunk.gen_vertex_data(neighbor_block);
     }
     */
-    std::for_each(std::execution::par, m_chunks.begin(), m_chunks.end(), [](auto& chunk_map){
-        auto& [chunk_pos, chunk] = chunk_map;
-        chunk.init_chunk();
+    std::vector<Chunk*> chunk_ptrs;
+    chunk_ptrs.reserve(m_chunks.size());
+    for (auto& [pos, chunk] : m_chunks) {
+        chunk_ptrs.push_back(&chunk);
+    }
+
+    std::for_each(std::execution::par, chunk_ptrs.begin(), chunk_ptrs.end(), [](auto& chunk){
+        chunk->init_chunk();
     });
+
+    std::atomic<int> sync{0};
+    sync.store(1, std::memory_order_release);
+    sync.load(std::memory_order_acquire);
+    
     std::vector<ChunkRenderData> pending_gen_data;
+    pending_gen_data.reserve(m_chunks.size());
     for (auto& [pos, chunk] : m_chunks) {
         ChunkRenderData data;
         data.chunk = &chunk;
@@ -239,7 +250,7 @@ void World::gen_chunks_internal() {
         new_chunks.push_back({pos, Chunk(*this, pos)});
     }
     
-    std::unordered_map<ChunkPos, const Chunk&, ChunkPos::Hash> neighbor;
+    std::unordered_map<ChunkPos, const Chunk*, ChunkPos::Hash> neighbor;
 
     {
         std::lock_guard lk(m_chunks_mutex);
@@ -247,7 +258,7 @@ void World::gen_chunks_internal() {
             for (const auto& dir : CHUNK_DIR) {
                 auto it = m_chunks.find(pos + dir);
                 if (it != m_chunks.end()) {
-                    neighbor.insert({it->first, (it->second)});
+                    neighbor.insert({it->first, &(it->second)});
                 }
             }
         }
@@ -258,7 +269,7 @@ void World::gen_chunks_internal() {
     for (auto& [pos, chunk] : new_chunks) {
 
         chunk.init_chunk();
-        neighbor.insert({pos, chunk});
+        neighbor.insert({pos, &chunk});
         
     }
 
@@ -266,7 +277,7 @@ void World::gen_chunks_internal() {
         for (int i = 0; i < 4; i++) {
             auto it = neighbor.find(pos + CHUNK_DIR[i]);
             if (it != neighbor.end()) {
-                neighbor_block[i] = &(it->second.get_chunk_blocks());
+                neighbor_block[i] = &(it->second->get_chunk_blocks());
             } else {
                 neighbor_block[i] = nullptr;
             }
@@ -340,7 +351,7 @@ bool World::is_aabb_in_frustum(const glm::vec3& center, const glm::vec3& half_ex
 
 int World::get_block(const glm::ivec3& block_pos) const {
     auto [chunk_x, chunk_z] = chunk_pos(block_pos.x, block_pos.z);
-
+    std::lock_guard lk(m_chunks_mutex);
     auto it = m_chunks.find(ChunkPos{chunk_x, chunk_z});
 
     if (it == m_chunks.end()) {
@@ -361,6 +372,7 @@ int World::get_block(const glm::ivec3& block_pos) const {
 
 bool World::is_block(const glm::ivec3& block_pos) const{
     auto [chunk_x, chunk_z] = chunk_pos(block_pos.x, block_pos.z);
+    std::lock_guard lk(m_chunks_mutex);
     auto it = m_chunks.find(ChunkPos{chunk_x, chunk_z});
 
     if (it == m_chunks.end()) {
@@ -390,7 +402,7 @@ void World::set_block(const glm::ivec3& block_pos, unsigned id) {
     world_z = block_pos.z;
 
     auto [chunk_x, chunk_z] = chunk_pos(world_x, world_z);
-
+    std::lock_guard lk(m_chunks_mutex);
     auto it = m_chunks.find(ChunkPos{chunk_x, chunk_z});
 
     if (it == m_chunks.end()) {
diff --git a/src/tools/cubed_random.cpp b/src/tools/cubed_random.cpp
index 7a346e1..04c363d 100644
--- a/src/tools/cubed_random.cpp
+++ b/src/tools/cubed_random.cpp
@@ -2,17 +2,32 @@
 
 #include <Cubed/tools/log.hpp>
 
+#include <atomic>
+
 namespace Cubed {
 
+unsigned Random::get_base_seed() {
+    static unsigned base = [] {
+        std::random_device rd;
+        return rd();
+    }();
+    return base;
+}
+
+unsigned Random::get_thread_seed() {
+    static std::atomic<unsigned> counter{0};
+    thread_local static unsigned seed = get_base_seed() + counter.fetch_add(1);
+    return seed;
+}
+
 Random::Random() {
-    std::random_device d;
-    m_seed = d();
+    m_seed = get_thread_seed();
     Logger::info("Seed: {}", m_seed);
     m_engine.seed(m_seed);
 }
 
 Random& Random::get() {
-    static Random instance;
+    thread_local Random instance;
     return instance;
 }
 
diff --git a/tsan.supp b/tsan.supp
new file mode 100644
index 0000000..8be7678
--- /dev/null
+++ b/tsan.supp
@@ -0,0 +1,15 @@
+# tsan.supp
+race:g_queue_pop_tail
+race:g_strsplit
+race:g_variant_type_info_get
+race:g_rec_mutex_lock
+race:libgallium
+race:libEGL_mesa
+race:libglib-2.0
+race:libglycin-2
+race:tbb::detail::d1::fold_tree
+race:libgio-2.0
+race:libtbb
+race:tbb::detail
+race:libpangoft2
+race:libfontconfig