diff --git a/src/wasm/worker.cpp b/src/wasm/worker.cpp
index 35ec87e..9bbcdb4 100644
--- a/src/wasm/worker.cpp
+++ b/src/wasm/worker.cpp
@@ -32,6 +32,7 @@
 #include <ctime>
 #include <fstream>
 #include <map>
+#include <cstdio>
 #include <memory>
 #include <optional>
 #include <string>
@@ -247,10 +248,54 @@ public:
 		String parse_error;
 		if(!wasm_parse_sections(bytes, core_dylink, abi_ignored, parse_error))
 			return("core module: " + parse_error);
+
+		String core_cached_path = cfg.core_wasm_path;
+		if(core_cached_path.size() >= 5 && core_cached_path.rfind(".wasm", core_cached_path.size() - 5) == core_cached_path.size() - 5)
+			core_cached_path = core_cached_path.substr(0, core_cached_path.size() - 5) + ".cwasm";
+		else
+			core_cached_path += ".cwasm";
+		struct stat core_stat;
+		struct stat cached_stat;
+		if(stat(core_cached_path.c_str(), &cached_stat) == 0 && stat(cfg.core_wasm_path.c_str(), &core_stat) == 0)
+		{
+			if(cached_stat.st_mtime > core_stat.st_mtime)
+			{
+				auto deserialized = wasmtime::Module::deserialize_file(engine, core_cached_path);
+				if(deserialized)
+				{
+					core_module.emplace(deserialized.ok());
+					return("");
+				}
+			}
+		}
+
 		auto compiled = wasmtime::Module::compile(engine, bytes);
 		if(!compiled)
 			return("core module compile failed: " + String(compiled.err().message()));
 		core_module.emplace(compiled.ok());
+
+		auto serialized = core_module->serialize();
+		if(serialized)
+		{
+			String tmp = core_cached_path + "." + std::to_string((long long)getpid()) + ".tmp";
+			auto data = serialized.ok();
+			{
+				std::ofstream out(tmp, std::ios::binary | std::ios::trunc);
+				if(out)
+				{
+					out.write((const char*)data.data(), (std::streamsize)data.size());
+					if(out)
+					{
+						out.flush();
+						out.close();
+						if(std::rename(tmp.c_str(), core_cached_path.c_str()) != 0)
+							(void)std::remove(tmp.c_str());
+					}
+				}
+				else
+					(void)std::remove(tmp.c_str());
+			}
+		}
 		return("");
 	}