.python_history file causes considerable slowdown

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-08-16.11:42:32.757>
labels = ['build', '3.8', 'performance']
title = '.python_history file causes considerable slowdown'
updated_at = <Date 2020-08-17.10:33:46.799>
user = 'https://bugs.python.org/bytecookie'

bugs.python.org fields:

activity = <Date 2020-08-17.10:33:46.799>
actor = 'bytecookie'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Build']
creation = <Date 2020-08-16.11:42:32.757>
creator = 'bytecookie'
dependencies = []
files = []
hgrepos = []
issue_num = 41563
keywords = []
message_count = 5.0
messages = ['375505', '375506', '375538', '375539', '375540']
nosy_count = 2.0
nosy_names = ['steven.daprano', 'bytecookie']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue41563'
versions = ['Python 3.8']