diff --git a/epilogue/archive_generator.py b/epilogue/archive_generator.py
index 80892fd..6f2341b 100644
--- a/epilogue/archive_generator.py
+++ b/epilogue/archive_generator.py
@@ -2,6 +2,8 @@ import os
 import logging
 import shutil
 import math
+import json
+import gzip
 
 from itertools import chain
 from traceback import print_exc
@@ -24,6 +26,8 @@ DEX_TYPES = [
 ]
 DEXES = list(chain.from_iterable([[f"{dex_type}{language}" for dex_type in DEX_TYPES] for language in DEX_LANGUAGES]))
 
+FORUM_THREAD_INDEX = "thread_index.json.gz"
+
 class ArchiveLinker(Linker):
     def __init__ (self, directory_names=[]):
         super().__init__()
@@ -158,10 +162,15 @@ class ArchiveGenerator():
             "categories": forum.get_board_tree()
         })
 
+        threads = []
         for board in forum.get_boards():
-            self.generate_forum_board(forum, board, out_dir)
+            forum_threads = forum.get_threads_in_board(board)
+            threads = threads + forum_threads
+            self.generate_forum_board(forum, board, forum_threads, out_dir)
 
-    def generate_forum_board (self, forum, board, out_dir):
+        self.generate_thread_index(threads, os.path.join(out_dir, FORUM_THREAD_INDEX))
+
+    def generate_forum_board (self, forum, board, threads, out_dir):
         board_out_dir = os.path.join(out_dir, "board-{}".format(board.id))
         logger.info("Archiving board %s to %s", board.name, board_out_dir)
         try:
@@ -169,7 +178,7 @@ class ArchiveGenerator():
         except FileExistsError: pass
 
         renderer = TemplateRenderer(self.template_dir, board_out_dir)
-        threads = [prepare_thread(thread) for thread in forum.get_threads_in_board(board)]
+        threads = [prepare_thread(thread) for thread in threads]
         renderer.render_template_to_file("threads", "index.html", {
             "title": " - {}".format(board.name),
             "base": "../",
@@ -214,6 +223,13 @@ class ArchiveGenerator():
             })
             page = page + 1
 
+    def generate_thread_index (self,threads, out_path):
+#        with open(out_path, "wb") as out:
+#            pickle.dump({thread.id: {"parent": thread.parent} for thread in threads}, out, protocol=4)        
+        threads = {thread.id: {"parent": thread.parent} for thread in threads}
+        with gzip.open(out_path, "w") as out:
+            out.write(json.dumps(threads).encode())
+
 class TemplateRenderer():
     def __init__ (self, template_dir, out_dir):
         self.template_dir = template_dir