I'm creating an object of a S4 class that has two slots: ListExamples, which
is a list, and idx, which is an integer (as the code below).

Then, I read a data.frame file with 10000 (ten thousands) of lines and 10
columns, do some pre-processing and, basically, I store each line as an
element of a list in the slot ListExamples of the S4 object. However, any
kind of assignment operation (<-) that I try to do after this took a
considerable time.

Can anyone explain me why dois it happen? Is it possible to speed up an
script that deals with a big number of data (it might be data.frame or
list)?

Thank you,

André Rossi

setClass("Buffer",
    representation=representation(
        Listexamples = "list",
        idx = "integer"
    )
)

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