paste long data slow

I noticed that pasting long data (for example, entire web pages, or 1Mb of binary data) takes quite long (I think mainly because the terminal tries to update the screen at every char, correct me if my assumption is wrong).
So, (since detecting the "paste" action should be easy (is done during the "sudo detection"), so I thought that the pasting action could become faster preventing the screen updates (or reading the clipboard directly).
Thanks

Launchpad Details: [#LP1468438](https://bugs.launchpad.net/bugs/1468438) Nicolò Balzarotti - 2015-06-24 16:41:37 +0000

Start by reproducing the slowdown with a long web page or 1 MB of binary data, then inspect the paste path around the mentioned sudo detection and terminal screen updates. Done means long pastes complete substantially faster without changing the pasted output or terminal behavior.

Written by the indexing model from the issue text.