I'm plastered right now so I'm more talkative. I'm friggin' everywhere right now.

Anyways, I'll give the answers I alluded to like a jackass in the other comment.

There are a few answers I can give that, when placed together, kind of form my own opinion.

The first is that, according to a few threads at Encyclopedia Titanica and a book or two that I'm trying to track down, Titanic was 4 1/2 hours behind schedule by Sunday afternoon. That was due to a delayed departure, a near-collision with the SS City of New York in the Southampton Harbour and a delayed turn at The Corner in the mid-Atlantic that Sunday afternoon before she struck the iceberg.

There doesn't appear to be an attempt to make up for lost time. Titanic was operating at the same RPM that Olympic was on her maiden voyage, though I don't recall any discussion on her being late or not. Apparently, the discussion that the passenger overheard between Captain Smith and Joseph Ismay may have been about speeding up on Monday morning after they cleared the ice.

The possibility that Titanic could have appeared in New York on Tuesday night has been discussed on ET. However, letters have arisen from Bruce Ismay talking to his cohorts that such an arrival would be impractical because the passengers would have no where to go since they'd be counting on arriving Wednesday morning. Ships ran like clockwork and anything upsetting that can cause problems, that includes arriving early.

Once again, I'd recco end scouring Encyclopedia Titanica for all of this. You will also find many other interesting tidbits about the ship and how it was operated.

EDITS I'll edit in various threads that answer the question and back me up as I go along.

http://www.encyclopedia-titanica.org/forums/collision-sinking-theories/10006-speed-blame.html

http://www.encyclopedia-titanica.org/forums/ismay-joseph-bruce/20558-ismay-speed-titanic.html

http://www.titanichistoricalsociety.org/articles/ismay.html

From the last link, which quotes letters from Ismay to his cohorts, it appears that a different picture is true. Ismay was the one against Titanic arriving early while he was under pressure to make her go faster.

The 3rd link seems to directly answer your question. I apologize sincerely for my laziness.