diff --git a/src/logic/scripting/lua/libs/libworld.cpp b/src/logic/scripting/lua/libs/libworld.cpp
index 1acc1ad7..832f2e2e 100644
--- a/src/logic/scripting/lua/libs/libworld.cpp
+++ b/src/logic/scripting/lua/libs/libworld.cpp
@@ -7,6 +7,7 @@
 #include "coders/compression.hpp"
 #include "coders/gzip.hpp"
 #include "coders/json.hpp"
+#include "coders/rle.hpp"
 #include "engine/Engine.hpp"
 #include "files/engine_paths.hpp"
 #include "files/files.hpp"
@@ -123,45 +124,44 @@ static int l_get_generator(lua::State* L) {
 }
 
 static int l_get_chunk_data(lua::State* L) {
-    int x = (int)lua::tointeger(L, 1);
-    int y = (int)lua::tointeger(L, 2);
+    int x = static_cast<int>(lua::tointeger(L, 1));
+    int y = static_cast<int>(lua::tointeger(L, 2));
     const auto& chunk = level->chunks->getChunk(x, y);
     if (chunk == nullptr) {
         lua::pushnil(L);
         return 0;
     }
 
-    bool compress = false;
+    bool compress = true;
     if (lua::gettop(L) >= 3) {
         compress = lua::toboolean(L, 3);
     }
     std::vector<ubyte> chunk_data;
     if (compress) {
-        size_t rle_compressed_size;
-        size_t gzip_compressed_size;
+        // world.get_chunk_data is only available in the main Lua state
+        static util::Buffer<ubyte> rlebuffer;
+        if (rlebuffer.size() < CHUNK_DATA_LEN * 2) {
+            rlebuffer = util::Buffer<ubyte>(CHUNK_DATA_LEN * 2);
+        }
+
         const auto& data_ptr = chunk->encode();
         ubyte* data = data_ptr.get();
-        const auto& rle_compressed_data_ptr = compression::compress(
-            data,
-            CHUNK_DATA_LEN,
-            rle_compressed_size,
-            compression::Method::EXTRLE16
-        );
-        const auto& gzip_compressed_data = compression::compress(
-            rle_compressed_data_ptr.get(),
-            rle_compressed_size,
-            gzip_compressed_size,
-            compression::Method::GZIP
+
+        size_t rle_compressed_size =
+            extrle::encode16(data, CHUNK_DATA_LEN, rlebuffer.data());
+
+        const auto gzip_compressed_data =  gzip::compress(
+            rlebuffer.data(), rle_compressed_size
         );
         auto tmp = dataio::h2le(rle_compressed_size);
-        chunk_data.reserve(gzip_compressed_size + sizeof(tmp));
+        chunk_data.reserve(gzip_compressed_data.size() + sizeof(tmp));
         chunk_data.insert(
             chunk_data.begin() + 0, (char*)&tmp, ((char*)&tmp) + sizeof(tmp)
         );
         chunk_data.insert(
             chunk_data.begin() + sizeof(tmp),
-            gzip_compressed_data.get(),
-            gzip_compressed_data.get() + gzip_compressed_size
+            gzip_compressed_data.data(),
+            gzip_compressed_data.data() + gzip_compressed_data.size()
         );
     } else {
         const auto& data = chunk->encode();
@@ -174,10 +174,10 @@ static int l_get_chunk_data(lua::State* L) {
 }
 
 static int l_set_chunk_data(lua::State* L) {
-    int x = (int)lua::tointeger(L, 1);
-    int y = (int)lua::tointeger(L, 2);
+    int x = static_cast<int>(lua::tointeger(L, 1));
+    int y = static_cast<int>(lua::tointeger(L, 2));
     auto buffer = lua::touserdata<lua::LuaBytearray>(L, 3);
-    bool is_compressed = false;
+    bool is_compressed = true;
     if (lua::gettop(L) >= 4) {
         is_compressed = lua::toboolean(L, 4);
     }
@@ -207,38 +207,32 @@ static int l_set_chunk_data(lua::State* L) {
     }
 
     auto chunksController = controller->getChunksController();
-    if (chunksController == nullptr) {
-        return 1;
+    if (chunksController->lighting == nullptr) {
+        return lua::pushboolean(L, true);
     }
 
     Lighting& lighting = *chunksController->lighting;
     chunk->updateHeights();
-    lighting.buildSkyLight(x, y);
-    chunk->flags.modified = true;
+    chunk->flags.loadedLights = false;
+    chunk->flags.lighted = false;
+    chunk->setModifiedAndUnsaved();
+    Lighting::prebuildSkyLight(*chunk, *indices);
     lighting.onChunkLoaded(x, y, true);
 
-    chunk = level->chunks->getChunk(x - 1, y);
-    if (chunk != nullptr) {
-        chunk->flags.modified = true;
-        lighting.onChunkLoaded(x - 1, y, true);
-    }
-    chunk = level->chunks->getChunk(x + 1, y);
-    if (chunk != nullptr) {
-        chunk->flags.modified = true;
-        lighting.onChunkLoaded(x + 1, y, true);
-    }
-    chunk = level->chunks->getChunk(x, y - 1);
-    if (chunk != nullptr) {
-        chunk->flags.modified = true;
-        lighting.onChunkLoaded(x, y - 1, true);
-    }
-    chunk = level->chunks->getChunk(x, y + 1);
-    if (chunk != nullptr) {
-        chunk->flags.modified = true;
-        lighting.onChunkLoaded(x, y + 1, true);
+    for (int lz = -1; lz <= 1; lz++) {
+        for (int lx = -1; lx <= 1; lx++) {
+            if (std::abs(lx) + std::abs(lz) != 1) {
+                continue;
+            }
+            chunk = level->chunks->getChunk(x + lx, y + lz);
+            if (chunk != nullptr) {
+                chunk->setModifiedAndUnsaved();
+                lighting.onChunkLoaded(x - 1, y, true);
+            }
+        }
     }
 
-    return 1;
+    return lua::pushboolean(L, true);
 }
 
 static int l_count_chunks(lua::State* L) {