tbl <- tibble(x = seq(10^4))
profvis::profvis(unnest(tbl, x))
sessioninfo::session_info()
## ─ Session info ──────────────────────────────────────────────────────────
##  setting  value                       
##  version  R version 3.6.1 (2019-07-05)
##  os       Ubuntu 19.04                
##  system   x86_64, linux-gnu           
##  ui       X11                         
##  language (EN)                        
##  collate  en_US.UTF-8                 
##  ctype    en_US.UTF-8                 
##  tz       Europe/Paris                
##  date     2019-07-29                  
## 
## ─ Packages ──────────────────────────────────────────────────────────────
##  package     * version    date       lib source                          
##  assertthat    0.2.1      2019-03-21 [1] CRAN (R 3.6.0)                  
##  backports     1.1.4      2019-04-10 [1] CRAN (R 3.6.0)                  
##  broom         0.5.2      2019-04-07 [1] CRAN (R 3.6.0)                  
##  cellranger    1.1.0      2016-07-27 [1] CRAN (R 3.6.0)                  
##  cli           1.1.0      2019-03-19 [1] CRAN (R 3.6.0)                  
##  colorspace    1.4-1      2019-03-18 [1] CRAN (R 3.6.0)                  
##  crayon        1.3.4      2017-09-16 [1] CRAN (R 3.6.0)                  
##  digest        0.6.20     2019-07-04 [1] CRAN (R 3.6.1)                  
##  dplyr       * 0.8.3      2019-07-04 [1] CRAN (R 3.6.1)                  
##  evaluate      0.14       2019-05-28 [1] CRAN (R 3.6.0)                  
##  forcats     * 0.4.0      2019-02-17 [1] CRAN (R 3.6.0)                  
##  generics      0.0.2      2018-11-29 [1] CRAN (R 3.6.0)                  
##  ggplot2     * 3.2.0      2019-06-16 [1] CRAN (R 3.6.0)                  
##  glue          1.3.1      2019-03-12 [1] CRAN (R 3.6.0)                  
##  gtable        0.3.0      2019-03-25 [1] CRAN (R 3.6.0)                  
##  haven         2.1.1      2019-07-04 [1] CRAN (R 3.6.1)                  
##  hms           0.5.0      2019-07-09 [1] CRAN (R 3.6.1)                  
##  htmltools     0.3.6      2017-04-28 [1] CRAN (R 3.6.0)                  
##  htmlwidgets   1.3        2018-09-30 [1] CRAN (R 3.6.0)                  
##  httr          1.4.0      2018-12-11 [1] CRAN (R 3.6.0)                  
##  jsonlite      1.6        2018-12-07 [1] CRAN (R 3.6.0)                  
##  knitr         1.23       2019-05-18 [1] CRAN (R 3.6.0)                  
##  lattice       0.20-38    2018-11-04 [1] standard (@0.20-38)             
##  lazyeval      0.2.2      2019-03-15 [1] CRAN (R 3.6.0)                  
##  lubridate     1.7.4      2018-04-11 [1] CRAN (R 3.6.0)                  
##  magrittr      1.5        2014-11-22 [1] CRAN (R 3.6.0)                  
##  modelr        0.1.4      2019-02-18 [1] CRAN (R 3.6.0)                  
##  munsell       0.5.0      2018-06-12 [1] CRAN (R 3.6.0)                  
##  nlme          3.1-140    2019-05-12 [1] CRAN (R 3.6.0)                  
##  pillar        1.4.2      2019-06-29 [1] CRAN (R 3.6.0)                  
##  pkgconfig     2.0.2      2018-08-16 [1] CRAN (R 3.6.0)                  
##  profvis       0.3.6      2019-05-14 [1] CRAN (R 3.6.1)                  
##  purrr       * 0.3.2      2019-03-15 [1] CRAN (R 3.6.0)                  
##  R6            2.4.0      2019-02-14 [1] CRAN (R 3.6.0)                  
##  Rcpp          1.0.2      2019-07-25 [1] CRAN (R 3.6.1)                  
##  readr       * 1.3.1      2018-12-21 [1] CRAN (R 3.6.0)                  
##  readxl        1.3.1      2019-03-13 [1] CRAN (R 3.6.0)                  
##  rlang         0.4.0      2019-06-25 [1] CRAN (R 3.6.0)                  
##  rmarkdown     1.14       2019-07-12 [1] CRAN (R 3.6.1)                  
##  rstudioapi    0.10       2019-03-19 [1] CRAN (R 3.6.0)                  
##  rvest         0.3.4      2019-05-15 [1] CRAN (R 3.6.0)                  
##  scales        1.0.0      2018-08-09 [1] CRAN (R 3.6.0)                  
##  sessioninfo   1.1.1      2018-11-05 [1] CRAN (R 3.6.0)                  
##  stringi       1.4.3      2019-03-12 [1] CRAN (R 3.6.0)                  
##  stringr     * 1.4.0      2019-02-10 [1] CRAN (R 3.6.0)                  
##  tibble      * 2.1.3      2019-06-06 [1] CRAN (R 3.6.0)                  
##  tidyr       * 0.8.3.9000 2019-07-29 [1] Github (tidyverse/tidyr@a0ecd23)
##  tidyselect    0.2.5      2018-10-11 [1] CRAN (R 3.6.0)                  
##  tidyverse   * 1.2.1      2017-11-14 [1] CRAN (R 3.6.0)                  
##  vctrs         0.2.0      2019-07-05 [1] CRAN (R 3.6.1)                  
##  withr         2.1.2      2018-03-15 [1] CRAN (R 3.6.0)                  
##  xfun          0.8        2019-06-25 [1] CRAN (R 3.6.0)                  
##  xml2          1.2.1      2019-07-29 [1] CRAN (R 3.6.1)                  
##  yaml          2.2.0      2018-07-25 [1] CRAN (R 3.6.0)                  
##  zeallot       0.1.0      2018-01-28 [1] CRAN (R 3.6.0)                  
## 
## [1] /home/eric/R/x86_64-pc-linux-gnu-library/3.6
## [2] /usr/local/lib/R/site-library
## [3] /usr/lib/R/site-library
## [4] /usr/lib/R/library