This is so true. I had a job in a factory making lights and after a day I was pull aside by the foreman and told to slow down. The funny thing is I was not even trying to be fast - I thought I was being really slow as I had been concentrating so much on getting every part perfect.

More seriously when you are new take the time to observe the culture of the place before saying or doing anything unexpected. Your primary job in the first month is learning the true power structure and who matters to who.