Binary transfer vs Text transfer - Mailing list pgsql-hackers

Hello, colleagues,

I have one question related to my current measurements results.

I am fetching integers in text format like:

Select * from table limit 10000000. It take 18.5 seconds to finish and the transfer data is 633 MB. 

When I fetching the same data using binary cursor, the transfer data is 480 MB, but the transfer time is 21.5 seconds?

So, I have one question could someone explain what can be the reason why the transferring time for binary data is higher?

Best regards,