Concatenate thousands of columns using UNITE

I have data frame (allgen) with nrow > 10k and ncol > 40K.
I would like to concatenate all columns in a single variable using UNITE. It works but it takes time (and I'm wondering if there is a better way to do it:

nrow(allgen) = 11824
ncol(allgen)= 42153

set first and last column

names(allgen)[2]-> start
names(allgen)[ncol(allgen)]-> end

system.time(allgen %>%
unite("S",start:end,sep='')-> test)

user system elapsed
192.35 0.03 193.01

Best

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