I am new to R and I have a big dataset with 17 columns and over a 1m rows. I want to split one of the columns into 4 by divider '/'. It's taking forever for R to complete the below commands. Is there a better way of completing the below. I have given as much code info as possible and would appreciate any help.

```
sample2 <- read.csv("week1.csv", header=TRUE)
summ1 <- subset(sample2,select= -c(3,7), subset =(SPORTS_ID =='1'))
summ1 <- summ1[,-c(1)]
library(splitstackshape)
summ2 <- concat.split.multiple(summ1,2 , "/")
summ2 <- summ2[,-c(1,15)]
summ3 <- concat.split.multiple(summ2,14, "v")
write.csv(summm3, file="test.csv")

```