ocon - 1:45 pm on Nov 9, 2012 (gmt 0)

I like to keep my website very fast, and among the many things I do is to use text stars instead of images for uses such as ratings and reviews. Specifically I use the ★ character.

However, I notice that this character is rendered very sharp in some browsers while kind of fuzzy and muddled in others, independent of operating system.

What causes this and is there anything I can do to ensure it stays sharp?