Avoid calling @stream.flush as it can block other HTTP/2 streams.

Author: ioquatix

lib/protocol/http2/framer.rb

@@ -103,8 +103,9 @@ def write_frame(frame)
 				# Async.logger.debug(self, name: "write") {frame.inspect}
 
 				frame.write(@stream)
-				
-				@stream.flush
+
+				# Don't call @stream.flush here because it can cause significant contention if there is a semaphore around this method.
+				# @stream.flush
 
 				return frame
 			end