Attempts at improving performance

app/redex.config

 {
   "redex" : {
     "passes" : [
+      "MethodDevirtualizationPass",
       "ReBindRefsPass",
-      "SynthPass",
       "FinalInlinePass",
-      "PeepholePass",
-      "ConstantPropagationPassV3",
-      "RedundantMoveEliminationPass",
-      "LocalDcePass",
-      "RemoveGotosPass",
       "DelSuperPass",
       "SingleImplPass",
-      "StaticReloPass",
+      "PeepholePass",
+      "ConstantPropagationPass",
+      "LocalDcePass",
+      "AnnoKillPass",
       "ReorderInterfacesPass",
       "RemoveEmptyClassesPass",
+      "SingleImplPass",
+      "InterDexPass",
+      "RemoveGotosPass",
+      "DedupBlocksPass",
       "ShortenSrcStringsPass",
-      "InstructionSelectionPass"
+      "RegAllocPass",
+      "CopyPropagationPass",
+      "LocalDcePass",
+      "DedupBlocksPass",
+      "StripDebugInfoPass"
     ]
   },
+  "RegAllocPass" : {
+    "live_range_splitting": "0"
+  },
   "SimpleInlinePass": {
-    "use_liveness" : true,
     "throws": true,
-    "multiple_callers": true
+    "multiple_callers": true,
+    "no_inline_annos" : [
+      "Lcom/fasterxml/jackson/databind/annotation/JsonDeserialize;"
+    ],
+    "black_list": [],
+    "caller_black_list": []
+  },
+  "ShortenSrcStringsPass" : {
+    "filename_mappings" : "filename_mappings.txt"
   },
   "FinalInlinePass" : {
     "propagate_static_finals": true,
     "replace_encodable_clinits": true,
-    "inline_string_fields": true,
-    "inline_wide_fields": true
+    "black_list_types" : []
+  },
+  "AnnoKillPass" : {
+    "keep_annos": [
+      "Landroid/view/ViewDebug$CapturedViewProperty;",
+      "Landroid/view/ViewDebug$ExportedProperty;",
+      "Landroid/webkit/JavascriptInterface;",
+      "Landroid/widget/RemoteViews$RemoteView;",
+      "Lcom/google/android/gms/common/annotation/KeepName;"
+    ],
+    "kill_annos" : [
+      "Lcom/google/inject/BindingAnnotation;"
+    ],
+    "force_kill_annos" : [
+      "Ldalvik/annotation/EnclosingClass;",
+      "Ldalvik/annotation/EnclosingMethod;",
+      "Ldalvik/annotation/InnerClass;",
+      "Ldalvik/annotation/MemberClasses;",
+      "Ldalvik/annotation/Throws;"
+    ]
   },
-  "RedundantMoveEliminationPass" : {
+  "ConstantPropagationPass" : {
+    "blacklist": [],
+    "replace_moves_with_consts": true,
+    "fold_arithmetic": true
+  },
+  "CopyPropagationPass" : {
     "eliminate_const_literals": false,
     "full_method_analysis": true
+  },
+  "MethodDevirtualizationPass" : {
+    "staticize_vmethods_not_using_this" : true,
+    "staticize_dmethods_not_using_this" : true
+  },
+  "StripDebugInfoPass" : {
+    "drop_all_dbg_info" : "0",
+    "drop_local_variables" : "1",
+    "drop_line_numbers" : "0",
+    "drop_src_files" : "0",
+    "use_whitelist" : "0",
+    "cls_whitelist" : [],
+    "method_whitelist" : [],
+    "drop_prologue_end" : "1",
+    "drop_epilogue_begin" : "1",
+    "drop_all_dbg_info_if_empty" : "1"
+  },
+  "PeepholePass" : {
+    "disabled_peepholes": [
+      "Replace_PutGet",
+      "Replace_PutGetWide",
+      "Replace_PutGetObject",
+      "Replace_PutGetShort",
+      "Replace_PutGetChar",
+      "Replace_PutGetByte",
+      "Replace_PutGetBoolean"
+    ]
+  },
+  "keep_packages": [
+    "Lcom/fasterxml/jackson/",
+    "Lcom/google/dexmaker/mockito/"
+  ],
+  "keep_annotations": [
+    "Lcom/google/common/annotations/VisibleForTesting;"
+  ],
+  "proguard_map_output": "redex_pg_mapping.txt",
+  "stats_output": "stats.txt",
+  "bytecode_offset_map": "bytecode_offset_map.txt",
+  "line_number_map_v2": "redex-line-number-map-v2",
+  "method_move_map" : "redex-moved-methods-map.txt",
+  "string_sort_mode" : "class_order",
+  "bytecode_sort_mode" : "class_order",
+  "ir_type_checker": {
+    "run_after_each_pass" : false,
+    "polymorphic_constants" : false,
+    "verify_moves" : false
   }
 }

lib/src/main/java/de/kuschku/libquassel/protocol/primitive/serializer/StringSerializer.kt

@@ -25,14 +25,13 @@ abstract class StringSerializer(
     }
   )
 
-  //private val charBuffer = ThreadLocal<CharBuffer>()
+  private val charBuffer = ThreadLocal<CharBuffer>()
 
   object UTF16 : StringSerializer(Charsets.UTF_16BE)
   object UTF8 : StringSerializer(Charsets.UTF_8)
   object C : StringSerializer(Charsets.ISO_8859_1, trailingNullByte = true)
 
   private inline fun charBuffer(len: Int): CharBuffer {
-    /*
     if (charBuffer.get() == null)
       charBuffer.set(CharBuffer.allocate(1024))
     val buf = if (len >= 1024)
@@ -42,8 +41,6 @@ abstract class StringSerializer(
     buf.clear()
     buf.limit(len)
     return buf
-    */
-    return CharBuffer.allocate(len)
   }
 
   override fun serialize(buffer: ChainedByteBuffer, data: String?, features: Quassel_Features) {