What steps will reproduce the problem? If possible, include the full Url
of any web page you see a problem on.
1. Include two CSS files or two JS files from the same domain in different
iframes.
2. Run Page Speed analysis.
What is the expected output? What do you see instead?
Page Speed says "There are -x- JavaScript files served from -y-. They
should be combined into as few files as possible."
Page Speed should not lower scores and recommend that files be combined if
they are placed in different iframes, since these files cannot be combined.
(perhaps this should only apply to cross-domain iframes, but I think it
should be any iframe)