library(microbenchmark)
microbenchmark(parallelDraws(1e5), serialDraws(1e5), rnorm(1e5))

Unit: microseconds
                 expr      min       lq     mean    median       uq        max neval
 parallelDraws(1e+05) 3113.752 3539.686 3687.794 3599.1540 3943.282   5058.376   100
   serialDraws(1e+05)  695.501  734.593 2536.940  757.2325  806.135 175712.496   100
         rnorm(1e+05) 6072.043 6264.030 6655.835 6424.0195 6661.739  18578.669   100

> bench::mark(parallelDraws(1e5), serialDraws(1e5), check = FALSE, min_iterations = 10)[,1:5]
# A tibble: 2 x 5
  expression                min   median `itr/sec` mem_alloc
  <bch:expr>           <bch:tm> <bch:tm>     <dbl> <bch:byt>
1 parallelDraws(1e+05)   1.08ms   1.78ms      558.     784KB
2 serialDraws(1e+05)   624.16µs  758.6µs     1315.     784KB

> bench::mark(parallelDraws(1e8), serialDraws(1e8), check = FALSE, min_iterations = 10)[,1:5]
# A tibble: 2 x 5
  expression                min   median `itr/sec` mem_alloc
  <bch:expr>           <bch:tm> <bch:tm>     <dbl> <bch:byt>
1 parallelDraws(1e+08)    326ms    343ms      2.91     763MB
2 serialDraws(1e+08)      757ms    770ms      1.30     763MB