[R]Fuzzy C-Means, different between ppclust vs e1071? no. of cluster = 10, data points = 6000

library(ppclust)
cm &lt;- fcm(x,centers = cen)


takes ~ 10 minutes

library(e1071)
cm &lt;- cmeans(x,cen,1000)


takes ~ 1 minute

the only reason I prefer ppclust is because it allows nstart, meaning I am not stuck with local optima.

Given both are doing same thing, why is one taking 10x time then other?
Look at the source code. The guts of e1071::cmeans are written in C, but ppclust::fcm looks like all R and has some ugly looking eval stuff which might make it dead slow.