[ perf ] Replace json-> orjson in hot path (#11221)

Signed-off-by: vincentzed <207368749+vincentzed@users.noreply.github.com>

python/sglang/srt/utils/common.py

@@ -12,7 +12,6 @@
 # limitations under the License.
 # ==============================================================================
 """Common utilities."""
-
 from __future__ import annotations
 
 import argparse
@@ -70,6 +69,7 @@ from typing import (
 )
 
 import numpy as np
+import orjson
 import psutil
 import pybase64
 import requests
@@ -1112,7 +1112,7 @@ def configure_logger(server_args, prefix: str = ""):
                 f"{SGLANG_LOGGING_CONFIG_PATH} but it does not exist!"
             )
         with open(SGLANG_LOGGING_CONFIG_PATH, encoding="utf-8") as file:
-            custom_config = json.loads(file.read())
+            custom_config = orjson.loads(file.read())
         logging.config.dictConfig(custom_config)
         return
     format = f"[%(asctime)s{prefix}] %(message)s"
@@ -2525,9 +2525,9 @@ def log_info_on_rank0(logger, msg):
 
 def load_json_config(data: str):
     try:
-        return json.loads(data)
+        return orjson.loads(data)
     except JSONDecodeError:
-        return json.loads(Path(data).read_text())
+        return orjson.loads(Path(data).read_text())
 
 
 def dispose_tensor(x: torch.Tensor):
@@ -3236,7 +3236,7 @@ def numa_bind_to_node(node: int):
 
 def json_list_type(value):
     try:
-        return json.loads(value)
+        return orjson.loads(value)
     except json.JSONDecodeError:
         raise argparse.ArgumentTypeError(
             f"Invalid JSON list: {value}. Please provide a valid JSON list."