To answer the question, as Scott and DA01 have already mentioned, it's just not possible.
To address your problem with performance:
You can make some adjustments to Photoshop's performance by going to
Edit -> Preferences -> Performance.
From there you can change how much RAM Photoshop is allowed to use. Bumping this up may make Photoshop fast but may slow down the rest of your machine while Photoshop is running.
You can also play with
History & Cache
The more cache levels you have, the slower Photoshop opens the file, but the more responsive it is while you work.
There's a great article here on the settings you can tweak to bring out the best performance given your hardware. They also have some helpful tips.
At the end of the day though, performance issues will come from your computer's hardware limitations. More RAM, faster processing and disk access, as well as video cards (GPU) can all help with the performance in one way or another.