doc: add performance notes for fs.readFile#36880
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Issue #25741 discusses a number of
performance considerations for fs.readFile, which was changed in Node.js
10.x to split discreet chunk reads over multiple event loop turns. While
the fs.readFile() operation is certainly slower than it was pre 10.x,
it's unlikely to be faster. Document the performance consideration and
link back to the issue for more in depth analysis.
Signed-off-by: James M Snell [email protected]
Fixes: #25741