I have a 700kb decompressed JS file which is loaded on every page. Before I had 12 javascript files on each page but to reduce http requests I compressed them all into 1 file.

This file is ~130kb gzipped and is served over gzip. However on the local computer it is still unpacked and loaded on every page. Is this a performance issue?

I've profiled the javascript with firebug profiler but did not see any issues. The problem/illusion I am facing is there are jquery libraries compressed in that file that are sometimes not used on the current page.

For example jquery datatables is 200kb compressed and that is only loaded on 2 of my website pages. Another is jqplot and that is another 200kb.

I now have 400kb of excess code that isn't executed on 80% of the pages.

Should I leave everything in 1 file?

Should I take out the jquery libraries and load only relevant JS on the current page?