separate_rows is significantly slow in R 4.0.0

After I install R 4.0.0, separate_rows of tidyr is significantly slower than 3.6.
I tried to separate 500,000 rows, but I took at least 100 times slower.

Am I the only one who experience this issue or something is not right.

HI @jjnote,
Welcome to the RStudio Community Forum.

I just tested a 6000 row data frame using tidyr::separate_rows(), and it took more than 3 times as long in R-4.0.0 compared to R-3.6.3.

Not sure why this is happening. Hopefully a tidyverse expert can shed light on this.

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