chore: remove benchmark profiling mode from PR

Move --profile flag and Makefile targets (benchmark-profile,
benchmark-profile-spy) to a separate patch for a future PR.
This PR now contains only runtime performance optimizations.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

libs/langgraph/Makefile

@@ -1,4 +1,4 @@
-.PHONY: all format lint type test test_watch integration_tests spell_check spell_fix benchmark benchmark-profile benchmark-profile-spy profile start-dev-server integration_tests
+.PHONY: all format lint type test test_watch integration_tests spell_check spell_fix benchmark profile start-dev-server integration_tests
 
 # Default target executed when no arguments are given to make.
 all: help
@@ -24,14 +24,6 @@ benchmark-fast:
 	rm -f $(OUTPUT)
 	uv run python -m bench -o $(OUTPUT) --fast
 
-benchmark-profile:
-	mkdir -p out
-	uv run python -m bench --profile
-
-benchmark-profile-spy:
-	mkdir -p out
-	sudo uv run py-spy record -g -o out/benchmark-flamegraph.svg -- python -m bench --fast
-
 GRAPH ?= bench/fanout_to_subgraph.py
 
 profile:

libs/langgraph/bench/__main__.py

@@ -1,9 +1,10 @@
 import random
-import sys
 from uuid import uuid4
 
 from langchain_core.messages import HumanMessage
 from langgraph.checkpoint.memory import InMemorySaver
+from pyperf._runner import Runner
+from uvloop import new_event_loop
 
 from bench.fanout_to_subgraph import fanout_to_subgraph, fanout_to_subgraph_sync
 from bench.pydantic_state import pydantic_state
@@ -463,54 +464,6 @@ benchmarks = (
 )
 
 
-if "--profile" in sys.argv:
-    import asyncio
-    import cProfile
-    import pstats
-    from pathlib import Path
-
-    out_dir = Path("out")
-    out_dir.mkdir(exist_ok=True)
-
-    for name, agraph, graph, input_data in benchmarks:
-        # Profile async variant
-        prof = cProfile.Profile()
-        prof.enable()
-        asyncio.run(arun(agraph, input_data))
-        prof.disable()
-
-        prof_path = out_dir / f"{name}.prof"
-        prof.dump_stats(str(prof_path))
-
-        print(f"\n{'=' * 60}")
-        print(f"PROFILE: {name}")
-        print(f"{'=' * 60}")
-        stats = pstats.Stats(prof)
-        stats.sort_stats("cumulative")
-        stats.print_stats(20)
-
-        # Profile sync variant
-        if graph is not None:
-            prof = cProfile.Profile()
-            prof.enable()
-            run(graph, input_data)
-            prof.disable()
-
-            prof_path = out_dir / f"{name}_sync.prof"
-            prof.dump_stats(str(prof_path))
-
-            print(f"\n{'=' * 60}")
-            print(f"PROFILE: {name}_sync")
-            print(f"{'=' * 60}")
-            stats = pstats.Stats(prof)
-            stats.sort_stats("cumulative")
-            stats.print_stats(20)
-
-    sys.exit(0)
-
-from pyperf._runner import Runner
-from uvloop import new_event_loop
-
 r = Runner()
 
 # Full graph run time