Most laptop screens are big enough for it to work fine on. Basically anything widesceen will be big enough and any 4:3 screen 17" or bigger is fine. I think you should treat yourself to a bigger screen

15" is pretty small now days and monitors are really cheap. I use 2 monitors on my PC, 22" wide screen as my main screen and a 15" (just for my emails so I can see emails come in as I work).
I have tried running the site on my little 15" and it is pretty bad but not many people are running little 15" screens anymore. That's why I only use my 15" as a 2nd screen for emails.
But it is a good idea to have a low res version of the page so if you or anyone else wants me to I will create a low res version that you can opt to use.