diff --git a/CHANGELOG.md b/CHANGELOG.md
index efa6d33a9c..50c354a84e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,25 @@
+## 0.18.15-dev2
+
+### Enhancements
+- Speed up function _assign_hash_ids by 34% (codeflash)
+
+### Features
+
+### Fixes
+
+## 0.18.15-dev1
+
+### Enhancements
+- Speed up function group_broken_paragraphs by 30% (codeflash)
+
+### Features
+
+### Fixes
+
 ## 0.18.15-dev0
 
 ### Enhancements
+- Optimized the runtime of `ElementHtml._get_children_html`
 
 ### Features
 
diff --git a/unstructured/__version__.py b/unstructured/__version__.py
index 9d8d327217..d4a801ee5e 100644
--- a/unstructured/__version__.py
+++ b/unstructured/__version__.py
@@ -1 +1 @@
-__version__ = "0.18.15-dev0"  # pragma: no cover
+__version__ = "0.18.15-dev2"  # pragma: no cover
diff --git a/unstructured/partition/common/metadata.py b/unstructured/partition/common/metadata.py
index 29704d97d0..08b0fe9597 100644
--- a/unstructured/partition/common/metadata.py
+++ b/unstructured/partition/common/metadata.py
@@ -5,7 +5,6 @@
 import copy
 import datetime as dt
 import functools
-import itertools
 import os
 from typing import Any, Callable, Iterator, Sequence
 
@@ -252,15 +251,12 @@ def _assign_hash_ids(elements: list[Element]) -> list[Element]:
     or more fragments for parallel processing.
     """
     # -- generate sequence number for each element on a page --
-    page_numbers = [e.metadata.page_number for e in elements]
-    page_seq_numbers = [
-        seq_on_page
-        for _, group in itertools.groupby(page_numbers)
-        for seq_on_page, _ in enumerate(group)
-    ]
-
-    for element, seq_on_page_counter in zip(elements, page_seq_numbers):
+    page_seq_counts = {}
+    for element in elements:
+        page_number = element.metadata.page_number
+        seq_on_page_counter = page_seq_counts.get(page_number, 0)
         element.id_to_hash(seq_on_page_counter)
+        page_seq_counts[page_number] = seq_on_page_counter + 1
 
     return elements