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...I doo see a ~ 20%? performance loss for the example above, and I may get to look into this. However, in R-devel there have been important internal changes (ALTREP additions) some of which are currently giving some performance losses in some cases (but they have the potential to give big performance _gains_ e.g. for simple indexing into large vectors which may apply here !). For factor(), these C level "ALTREP" changes may not be the reason at all for the slow down; I may find time to investigate further. {{ For the ALTREP-change slowdowns I've noticed in some ? indexing/subset operatio...

...I doo see a ~ 20% performance loss for the example above, and I may get to look into this. However, in R-devel there have been important internal changes (ALTREP additions) some of which are currently giving some performance losses in some cases (but they have the potential to give big performance _gains_ e.g. for simple indexing into large vectors which may apply here !). For factor(), these C level "ALTREP" changes may not be the reason at all for the slow down; I may find time to investigate further. {{ For the ALTREP-change slowdowns I've noticed in some indexing/subset operati...

...I doo see a ~ 20% performance loss for the example above, and I may get to look into this. However, in R-devel there have been important internal changes (ALTREP additions) some of which are currently giving some performance losses in some cases (but they have the potential to give big performance _gains_ e.g. for simple indexing into large vectors which may apply here !). For factor(), these C level "ALTREP" changes may not be the reason at all for the slow down; I may find time to investigate further. {{ For the ALTREP-change slowdowns I've noticed in some indexing/subset operati...

...I doo see a ~ 20%? performance loss for the example above, and I may get to look into this. However, in R-devel there have been important internal changes (ALTREP additions) some of which are currently giving some performance losses in some cases (but they have the potential to give big performance _gains_ e.g. for simple indexing into large vectors which may apply here !). For factor(), these C level "ALTREP" changes may not be the reason at all for the slow down; I may find time to investigate further. {{ For the ALTREP-change slowdowns I've noticed in some ?? indexing/subset operati...

In R devel, function 'factor' has been changed, allowing and merging duplicated 'labels'. Issue 1: Handling of specified 'labels' without duplicates is slower than before. Example: x <- rep(1:26, 40000) system.time(factor(x, levels=1:26, labels=letters)) Function 'factor' is already rather slow because of conversion to character. Please don't add slowdown.