Is it normal that it takes a very long time to generate a connection object on a big character vector?

This takes a very long time to process:
lines <- readLines ("myBigFile.txt")
data <- scan(textConnection(lines), sep = "\t")

against this that is pretty short to process:
data <- scan("myBigFile.txt", sep = "\t")

Anyone has any clues how to efficiently do that because I need to use a textConnection on a big vector?

Thank you,
Mathieu

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