I'm not really sure where your question is about Perl.

Some general hints:

1. Benchmark to find where the bottleneck is. You're sending 7MB over the wire, which is a lot of data. Maybe split up the Javascript into smaller files that don't need to be loaded every access.
2. If you're generating the Javascript from Perl, look whether you can create the Javascript as static files, thus reducing the time it takes until the answer can be sent.
3. Consider eliminating the Javascript alltogether and only deliver information when it is requested instead of all information at once. This is the part where Perl is of most help I guess.