GeezerVison

import pyperf
import tokenize

# wc -l $(find -name "*.py")|sort -n
large_files = """
    5259 ./Tools/clinic/clinic.py
    5553 ./Lib/test/test_email/test_email.py
    5577 ./Lib/test/test_argparse.py
    5659 ./Lib/test/test_logging.py
    5806 ./Lib/test/test_descr.py
    5878 ./Lib/test/test_decimal.py
    5993 ./Lib/test/_test_multiprocessing.py
    6425 ./Lib/_pydecimal.py
    6626 ./Lib/test/datetimetester.py
    6664 ./Lib/test/test_socket.py
    7325 ./Lib/test/test_typing.py
   15534 ./Lib/pydoc_data/topics.py
"""
large_files = [line.split()[-1] for line in large_files.splitlines() if line.strip()]

files = []
for filename in large_files:
    with tokenize.open(filename) as fp:
        content = fp.read()
    files.append((filename, content))

def bench(files):
    for filename, content in files:
        compile(content, filename, "exec")

runner = pyperf.Runner()
runner.bench_func('compile', bench, files)

$ python3 -m pyperf compare_to ref.json pr.json 
Mean +- std dev: [ref] 1.40 sec +- 0.02 sec -> [pr] 1.93 sec +- 0.01 sec: 1.37x slower

$ python3 -m pyperf compare_to ref.json pr2.json 
Mean +- std dev: [ref] 1.40 sec +- 0.02 sec -> [pr2] 1.43 sec +- 0.04 sec: 1.02x slower