What they call it is an "initial warning", but what it really means is that you're on notice--get up to speed or you're out of here in 60 days.
I started as a part-time check encoder at the bank because I needed a safety net until I got more database and web freelance business. What was supposed to be a 25-hour a week job turned into pretty much a full-time second shift one, since they couldn't get enough trainees to come in and stay. A lot of the old hands left when their bonus plans were taken away. For a while we were working til after 1 a.m. every night, sometimes til 3.
But now, things have eased up. I never got to be fast, in fact I never got up to "quota" speed. No complaints while they were so shorthanded. But the old hands, who had left months ago, asked to come back. They missed their benefits. And now, we've served our purpose.
Which is not necessarily a bad thing at all. Being on notice gets me the privilege of applying for another job at the company--from the inside, as a current employee. Not bad. Best thing the world would be to get out of that department.