As I have received many request to optimized the Javascript for WP-Polls (I will also do it for other plugins but I will beta test it with WP-Polls first), I have used Dean Edwards Packer [1] to pack my Javascript for WP-Polls and then I have moved the Dynamic Javascript variables out of the Javascript file and into the PHP page and now I can renamed it back to .js extension instead of .php.
These 2 things that I have done should help reduce the load on the server.
If are interested to test it out, you can download WP-Polls 2.30 Beta 1 [2].