diff --git a/package.json b/package.json
index 6ac9579..066a241 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
   },
   "scripts": {
     "prepublish": "require-self",
-    "test": "mocha --recursive --reporter spec",
+    "test": "mocha --recursive --reporter spec --exit",
     "lint": "standard",
     "fix": "standard --fix",
     "pretest": "npm run lint"
@@ -39,7 +39,7 @@
     "mocha": "^7.0.1",
     "power-assert": "^1.0.0",
     "require-self": "^0.2.1",
-    "standard": "^14.0.0"
+    "standard": "^14.3.4"
   },
   "dependencies": {
     "yggdrasil": "^1.3.0",
@@ -50,8 +50,8 @@
     "lodash.merge": "^4.3.0",
     "minecraft-data": "^2.44.0",
     "node-rsa": "^0.4.2",
-    "prismarine-nbt": "^1.2.1",
-    "protodef": "^1.6.7",
+    "prismarine-nbt": "^1.3.0",
+    "protodef": "^1.7.0",
     "readable-stream": "^3.0.6",
     "uuid-1345": "^1.0.1"
   }
diff --git a/src/datatypes/compiler-minecraft.js b/src/datatypes/compiler-minecraft.js
new file mode 100644
index 0000000..f91d667
--- /dev/null
+++ b/src/datatypes/compiler-minecraft.js
@@ -0,0 +1,71 @@
+const UUID = require('uuid-1345')
+const minecraft = require('./minecraft')
+
+module.exports = {
+  Read: {
+    UUID: ['native', (buffer, offset) => {
+      return {
+        value: UUID.stringify(buffer.slice(offset, 16 + offset)),
+        size: 16
+      }
+    }],
+    restBuffer: ['native', (buffer, offset) => {
+      return {
+        value: buffer.slice(offset),
+        size: buffer.length - offset
+      }
+    }],
+    nbt: ['native', minecraft.nbt[0]],
+    optionalNbt: ['native', minecraft.optionalNbt[0]],
+    compressedNbt: ['native', minecraft.compressedNbt[0]],
+    entityMetadataLoop: ['parametrizable', (compiler, { type, endVal }) => {
+      let code = 'let cursor = offset\n'
+      code += 'const data = []\n'
+      code += 'while (true) {\n'
+      code += `  if (ctx.u8(buffer, cursor).value === ${endVal}) return { value: data, size: cursor + 1 - offset }\n`
+      code += '  const elem = ' + compiler.callType(type, 'cursor') + '\n'
+      code += '  data.push(elem.value)\n'
+      code += '  cursor += elem.size\n'
+      code += '}'
+      return compiler.wrapCode(code)
+    }]
+  },
+  Write: {
+    UUID: ['native', (value, buffer, offset) => {
+      const buf = UUID.parse(value)
+      buf.copy(buffer, offset)
+      return offset + 16
+    }],
+    restBuffer: ['native', (value, buffer, offset) => {
+      value.copy(buffer, offset)
+      return offset + value.length
+    }],
+    nbt: ['native', minecraft.nbt[1]],
+    optionalNbt: ['native', minecraft.optionalNbt[1]],
+    compressedNbt: ['native', minecraft.compressedNbt[1]],
+    entityMetadataLoop: ['parametrizable', (compiler, { type, endVal }) => {
+      let code = 'for (const i in value) {\n'
+      code += '  offset = ' + compiler.callType('value[i]', type) + '\n'
+      code += '}\n'
+      code += `return offset + ctx.u8(${endVal}, buffer, offset)`
+      return compiler.wrapCode(code)
+    }]
+  },
+  SizeOf: {
+    UUID: ['native', 16],
+    restBuffer: ['native', (value) => {
+      return value.length
+    }],
+    nbt: ['native', minecraft.nbt[2]],
+    optionalNbt: ['native', minecraft.optionalNbt[2]],
+    compressedNbt: ['native', minecraft.compressedNbt[2]],
+    entityMetadataLoop: ['parametrizable', (compiler, { type }) => {
+      let code = 'let size = 1\n'
+      code += 'for (const i in value) {\n'
+      code += '  size += ' + compiler.callType('value[i]', type) + '\n'
+      code += '}\n'
+      code += 'return size'
+      return compiler.wrapCode(code)
+    }]
+  }
+}
diff --git a/src/transforms/serializer.js b/src/transforms/serializer.js
index de5f2d4..3a6d5ac 100644
--- a/src/transforms/serializer.js
+++ b/src/transforms/serializer.js
@@ -3,6 +3,7 @@
 const ProtoDef = require('protodef').ProtoDef
 const Serializer = require('protodef').Serializer
 const Parser = require('protodef').FullPacketParser
+const { ProtoDefCompiler } = require('protodef').Compiler
 
 const minecraft = require('../datatypes/minecraft')
 const states = require('../states')
@@ -11,23 +12,33 @@ const get = require('lodash.get')
 
 const protocols = {}
 
-function createProtocol (state, direction, version, customPackets) {
-  const key = state + ';' + direction + ';' + version
+function createProtocol (state, direction, version, customPackets, compiled = true) {
+  const key = state + ';' + direction + ';' + version + (compiled ? ';c' : '')
   if (protocols[key]) { return protocols[key] }
+  const mcData = require('minecraft-data')(version)
+
+  if (compiled) {
+    const compiler = new ProtoDefCompiler()
+    compiler.addTypes(require('../datatypes/compiler-minecraft'))
+    compiler.addProtocol(merge(mcData.protocol, get(customPackets, [mcData.version.majorVersion])), [state, direction])
+    const proto = compiler.compileProtoDefSync()
+    protocols[key] = proto
+    return proto
+  }
+
   const proto = new ProtoDef(false)
   proto.addTypes(minecraft)
-  const mcData = require('minecraft-data')(version)
   proto.addProtocol(merge(mcData.protocol, get(customPackets, [mcData.version.majorVersion])), [state, direction])
   protocols[key] = proto
   return proto
 }
 
-function createSerializer ({ state = states.HANDSHAKING, isServer = false, version, customPackets } = {}) {
-  return new Serializer(createProtocol(state, !isServer ? 'toServer' : 'toClient', version, customPackets), 'packet')
+function createSerializer ({ state = states.HANDSHAKING, isServer = false, version, customPackets, compiled = true } = {}) {
+  return new Serializer(createProtocol(state, !isServer ? 'toServer' : 'toClient', version, customPackets, compiled), 'packet')
 }
 
-function createDeserializer ({ state = states.HANDSHAKING, isServer = false, version, customPackets } = {}) {
-  return new Parser(createProtocol(state, isServer ? 'toServer' : 'toClient', version, customPackets), 'packet')
+function createDeserializer ({ state = states.HANDSHAKING, isServer = false, version, customPackets, compiled = true } = {}) {
+  return new Parser(createProtocol(state, isServer ? 'toServer' : 'toClient', version, customPackets, compiled), 'packet')
 }
 
 module.exports = {
diff --git a/test/packetTest.js b/test/packetTest.js
index bfa1893..2c610f2 100644
--- a/test/packetTest.js
+++ b/test/packetTest.js
@@ -77,7 +77,7 @@ const values = {
         results[typeArgs[index].name] = v
       }
     })
-    delete context['..']
+    delete results['..']
     return results
   },
   count: 1, // TODO : might want to set this to a correct value
@@ -268,8 +268,10 @@ mc.supportedVersions.forEach(function (supportedVersion, i) {
         }
       })
       Object.keys(p2).forEach(function (field) {
-        assert.ok(field in p1, 'field ' + field + ' missing in p1, in p2 it has value ' +
-          JSON.stringify(p2[field]))
+        if (p2[field] !== undefined) {
+          assert.ok(field in p1, 'field ' + field + ' missing in p1, in p2 it has value ' +
+            JSON.stringify(p2[field]))
+        }
       })
     }
   })