Sources Thomas Lumley, Github repo useRfasteR Hadley Wickham, Profiling , Advanced R
Dirk Eddelbuettel, Rcpp The Process for Improving Code: (quote from Advanced R)
Find the biggest bottleneck (the slowest part of your code). Try to eliminate it (you may not succeed but that’s ok). Repeat until your code is “fast enough.” Easy peasy, right???
Some general guidelines for speeding up R code Use data frames less - they are expensive to create, often copied in whole when modified, and their rownames attribute can really slow things down.