readline timeout too long for async gfx use

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-11-14.08:08:28.573>
labels = ['extension-modules', '3.8', '3.9', '3.10', 'performance']
title = 'readline timeout too long for async gfx use'
updated_at = <Date 2020-09-14.23:11:05.822>
user = 'https://github.com/pmp-p'

bugs.python.org fields:

activity = <Date 2020-09-14.23:11:05.822>
actor = 'pmpp'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Extension Modules']
creation = <Date 2018-11-14.08:08:28.573>
creator = 'pmpp'
dependencies = []
files = []
hgrepos = []
issue_num = 35243
keywords = []
message_count = 1.0
messages = ['329891']
nosy_count = 2.0
nosy_names = ['twouters', 'pmpp']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue35243'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']