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With line buffering, I see the issue.
 * 6 s without thread
 * 115 s with the spinning thread (varying: 60 s, 98 s)
 * 16 s with the spinning thread and the last "gilinter.patch"
# Modified version of the test case, with bufsize=1
from threading import Thread
import time
def writenums(f, n):
 start = time.time()
 for x in range(n):
 f.write("%d\n" % x)
 end = time.time()
 print(end-start)
def spin():
 while True:
 pass
t1 = Thread(target=spin)
t1.daemon=True
# Uncomment to add a thread
#t1.start()
# With line buffering
writenums(open("./nums", "w", 1), 1000000)