diff --git a/src/snek/service/channel_message.py b/src/snek/service/channel_message.py
index cbccedd..0694561 100644
--- a/src/snek/service/channel_message.py
+++ b/src/snek/service/channel_message.py
@@ -26,7 +26,7 @@ class ChannelMessageService(BaseService):
         self._executor_pools = {}
         global jinja2_env
         jinja2_env = self.app.jinja2_env
-        self._max_workers = 3
+        self._max_workers = 1
     def get_or_create_executor(self, uid):
         if not uid in self._executor_pools:
             self._executor_pools[uid] = ProcessPoolExecutor(max_workers=self._max_workers)