[Princeton]

I guess it would help but it will not be noticable.
I recommend keeping the variables as it decreases time spent on "editing" a style.

If it's the same server, you don't need the full image url ... I recommend against this practice.
For each full url, you are asking the server to check domain and fetch image (http hit).

- server doesn't understand what is "fred.com"
- server has to check and convert "fred.com" to something it understands
- server understand IP address
- server sends image

Servers are so fast to day, that you really don't see the difference but it could make a difference on big boards.