Some years back I had to do a poster for an event where I work, and it was going to be printed fairly large. I had a 500mz G4, which, when new, was a so-called “supercomputer,” but in recent years it was underpowered even compared to a Mac Mini. I worked on the file at a small dpi, say 300 dpi, at fairly small size. Then, when done, I autotraced it in Adobe Streamline and increased its size to the poster’s final dimensions. I then rasterized it in Photoshop–at the larger size–and did the coloring on the larger file. When it was printed, it looked sharp and fine, but most of the work had been done at a smaller original size.

Obviously, if you have an older, PowerPC Mac, this does not apply to you. But, if that’s the case, you likely aren’t able to run at 1200 dpi resolutions anyway. Since you’re on an Intel Mac as well, the bottom line is as follows: it runs faster on Windows.

Have you tried it, or having tried it, does it give you problems?