R Under development (unstable) (2023-05-23 r84461 ucrt) -- "Unsuffered Consequences"
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> suppressPackageStartupMessages(library(rgeos))
> nc34 <- readWKT(readLines(system.file("wkts/nc34.wkt", package="rgeos")))
> xF <- gSimplify(nc34, tol=5, topologyPreserve=FALSE)
> xT <- gSimplify(nc34, tol=5, topologyPreserve=TRUE)
> # https://github.com/r-spatial/sf/issues/1655#issuecomment-826358383
> 
> proc.time()
   user  system elapsed 
   0.53    0.12    0.64