$ ./python -X importtime -c 'import csv'
import time: self [us] | cumulative | imported package
...
import time:       229 |        229 | linecache
import time:       331 |        331 |   types
import time:       175 |        175 |   _csv
import time:       629 |       1134 | csv

$ hyperfine --warmup 8 "./python -c 'import csv'"
Benchmark 1: ./python -c 'import csv'
  Time (mean ± σ):       5.9 ms ±   0.4 ms    [User: 5.0 ms, System: 1.0 ms]
  Range (min … max):     5.5 ms …  11.0 ms    452 runs

$ ./python -X importtime -c 'import csv'
import time: self [us] | cumulative | imported package
...
import time:       227 |        227 | linecache
import time:       261 |        261 |       types
import time:      1419 |       1680 |     enum
import time:        62 |         62 |       _sre
import time:       218 |        218 |         re._constants
import time:       327 |        544 |       re._parser
import time:        79 |         79 |       re._casefix
import time:       287 |        971 |     re._compiler
import time:        90 |         90 |         itertools
import time:        86 |         86 |         keyword
import time:        46 |         46 |           _operator
import time:       187 |        233 |         operator
import time:       119 |        119 |         reprlib
import time:        45 |         45 |         _collections
import time:       733 |       1304 |       collections
import time:        39 |         39 |       _functools
import time:       498 |       1840 |     functools
import time:       114 |        114 |     copyreg
import time:       426 |       5029 |   re
import time:       107 |        107 |   _csv
import time:       575 |       5709 | csv

$ hyperfine --warmup 8 "./python -c 'import csv'"
Benchmark 1: ./python -c 'import csv'
  Time (mean ± σ):       9.2 ms ±   0.9 ms    [User: 8.0 ms, System: 1.2 ms]
  Range (min … max):     8.4 ms …  16.7 ms    297 runs