diff --git a/sphinx/builders/__init__.py b/sphinx/builders/__init__.py
index ae9dfeed1c5..2069ba78193 100644
--- a/sphinx/builders/__init__.py
+++ b/sphinx/builders/__init__.py
@@ -607,6 +607,15 @@ def _write_serial(self, docnames: Sequence[str]) -> None:
                 self.write_doc(docname, doctree)
 
     def _write_parallel(self, docnames: Sequence[str], nproc: int) -> None:
+        # warm up caches/compile templates using the first document
+        with TimeIt(f'{__file__}: {inspect.currentframe().f_code.co_name}: write 1st doc', self.runtime, logger):
+            firstname, docnames = docnames[0], docnames[1:]
+            self.app.phase = BuildPhase.RESOLVING
+            doctree = self.env.get_and_resolve_doctree(firstname, self)
+            self.app.phase = BuildPhase.WRITING
+            self.write_doc_serialized(firstname, doctree)
+            self.write_doc(firstname, doctree)
+
         def write_process(worker_id: int, docname: str) -> tuple[list[str], dict[str, str]]:
             # print(f'{getpid()}: {docname}')
             # print(f'{worker_id}: {docname}')
@@ -615,7 +624,7 @@ def write_process(worker_id: int, docname: str) -> tuple[list[str], dict[str, st
 
             self.app.phase = BuildPhase.WRITING
             doctree = self.env.get_and_resolve_doctree(docname, self)
-            # self.write_doc_serialized(docname, doctree)
+            self.write_doc_serialized(docname, doctree)
             self.write_doc(docname, doctree)
             # get warnings to log them in the main process, removing empty values
             # (in case the last ends on \n)
@@ -630,15 +639,6 @@ def write_process(worker_id: int, docname: str) -> tuple[list[str], dict[str, st
             #         new_warnings.append(warn_clean)
             return self.app._warnings_parallel, self.images
 
-        # warm up caches/compile templates using the first document
-        with TimeIt(f'{__file__}: {inspect.currentframe().f_code.co_name}: write 1st doc', self.runtime, logger):
-            firstname, docnames = docnames[0], docnames[1:]
-            self.app.phase = BuildPhase.RESOLVING
-            doctree = self.env.get_and_resolve_doctree(firstname, self)
-            self.app.phase = BuildPhase.WRITING
-            self.write_doc_serialized(firstname, doctree)
-            self.write_doc(firstname, doctree)
-
         # tasks = ParallelTasks(nproc)
         # chunks = make_chunks(docnames, nproc)
 
@@ -652,15 +652,15 @@ def on_chunk_done(args: list[tuple[str, NoneType]], result: NoneType) -> None:
 
         self.app.phase = BuildPhase.RESOLVING
         if docnames:
-            measure_1 = f'{__file__}: {inspect.currentframe().f_code.co_name}: get_doctree_write'
-            measure_2 = f'{__file__}: {inspect.currentframe().f_code.co_name}: write_doc_serialized'
-            for docname in docnames:
-                with TimeIt(measure_1, self.runtime, logger, False):
-                    doctree = self.env.get_doctree_write(docname)
-                with TimeIt(measure_2, self.runtime, logger, False):
-                    self.write_doc_serialized(docname, doctree)
-            logger.info(f'{measure_1}: {self.runtime[measure_1]}')
-            logger.info(f'{measure_2}: {self.runtime[measure_2]}')
+            # measure_1 = f'{__file__}: {inspect.currentframe().f_code.co_name}: get_doctree_write'
+            # measure_2 = f'{__file__}: {inspect.currentframe().f_code.co_name}: write_doc_serialized'
+            # for docname in docnames:
+            #     with TimeIt(measure_1, self.runtime, logger, False):
+            #         doctree = self.env.get_doctree_write(docname)
+            #     with TimeIt(measure_2, self.runtime, logger, False):
+            #         self.write_doc_serialized(docname, doctree)
+            # logger.info(f'{measure_1}: {self.runtime[measure_1]}')
+            # logger.info(f'{measure_2}: {self.runtime[measure_2]}')
 
             with WorkerPool(n_jobs=nproc, start_method='fork', use_dill=False, pass_worker_id=True, enable_insights=True) as pool:
                 # args = []