R Under development (unstable) (2024-02-14 r85901 ucrt) -- "Unsuffered Consequences"
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> suppressPackageStartupMessages(library(lwgeom))
> suppressPackageStartupMessages(library(sf))
> nc = st_read(system.file("gpkg/nc.gpkg", package="sf"), quiet = TRUE)
> nc = st_transform(nc, 3857)
> st_perimeter_lwgeom(nc)[1:5]
Units: [m]
[1] 176214.9 149265.4 199586.8 375137.8 263512.6
> st_perimeter_2d(nc)[1:5]
Units: [m]
[1] 176214.9 149265.4 199586.8 375137.8 263512.6
> 
> proc.time()
   user  system elapsed 
   0.81    0.20    1.00