My Faster Bash Startup (2020)(danpker.com)

  $ time mksh -c 'for i in $(seq 1000); do printf $(printf $(printf $(printf hello))); done' > /dev/null
  
  real    0m2.121s
  user    0m1.321s
  sys     0m0.875s

  $ time ksh -c 'for i in $(seq 1000); do printf $(printf $(printf $(printf hello))); done' > /dev/null
  
  real    0m0.013s
  user    0m0.008s
  sys     0m0.005s

  $ time dash -c 'for i in $(seq 1000); do printf $(printf $(printf $(printf hello))); done' > /dev/null
  
  real    0m0.311s
  user    0m0.279s
  sys     0m0.073s
  
  $ time bash -c 'for i in $(seq 1000); do printf $(printf $(printf $(printf hello))); done' > /dev/null
  
  real    0m0.664s
  user    0m0.538s
  sys     0m0.186s