GeezerVison

$ ./python -I -X importtime -c 'import base64'
import time: self [us] | cumulative | imported package
...
import time:       179 |        179 | linecache
import time:       205 |        205 |     _struct
import time:       442 |        646 |   struct
import time:       227 |        227 |   binascii
import time:       298 |       1169 | base64

$ hyperfine --warmup 16 "./python -c 'import base64'"
Benchmark 1: ./python -c 'import base64'
  Time (mean ± σ):       5.7 ms ±   0.5 ms    [User: 4.8 ms, System: 1.1 ms]
  Range (min … max):     5.2 ms …  11.9 ms    455 runs

$ ./python -I -X importtime -c 'import base64'
import time: self [us] | cumulative | imported package
...
import time:       180 |        180 | linecache
import time:       312 |        312 |       types
import time:      1609 |       1921 |     enum
import time:        87 |         87 |       _sre
import time:       250 |        250 |         re._constants
import time:       388 |        637 |       re._parser
import time:        89 |         89 |       re._casefix
import time:       339 |       1150 |     re._compiler
import time:       103 |        103 |         itertools
import time:        83 |         83 |         keyword
import time:        58 |         58 |           _operator
import time:       206 |        264 |         operator
import time:       129 |        129 |         reprlib
import time:        49 |         49 |         _collections
import time:       785 |       1411 |       collections
import time:        43 |         43 |       _functools
import time:       543 |       1997 |     functools
import time:       122 |        122 |     copyreg
import time:       826 |       6015 |   re
import time:       115 |        115 |     _struct
import time:        74 |        189 |   struct
import time:       122 |        122 |   binascii
import time:       279 |       6603 | base64

$ hyperfine --warmup 16 "./python -c 'import base64'"
Benchmark 1: ./python -c 'import base64'
  Time (mean ± σ):       9.5 ms ±   0.4 ms    [User: 8.2 ms, System: 1.3 ms]
  Range (min … max):     9.1 ms …  13.5 ms    295 runs