Google Site performance tool says Google is not serving Gzipped resources

Google just launched the Site Performance tool, an experimental feature in Webmaster Tools that shows you information about the speed of your site and suggestions for making it faster.

It's likely 2010 will be "the year of site speed" and this feature can become a really important information point. However, I just noticed a really weird behavior. Look at the following screenshot.

Google Site Performance suggestions for

Enable Ggzip compression

WTF?!? All the assets are linked from Google and Google does gzip compression. Why Google is saying Google is not Gzipping?

Headers don't lie.

Last-Modified: Mon, 08 Jun 2009 20:49:31 GMT
Content-Type: application/x-javascript; charset=UTF-8
Expires: Fri, 03 Dec 2010 07:13:27 GMT
Vary: Accept-Encoding
Content-Encoding: gzip
X-Content-Type-Options: nosniff
X-XSS-Protection: 0
X-Frame-Options: SAMEORIGIN
Cache-Control: public, max-age=31536000
Age: 4066
Content-Length: 45879
Server: GFE/2.0

200 OK

Combine external JavaScript

Hey Google, that would be great but I can't combine these libraries. You should combine them since you are serving the content and considering you are motivating webmasters to use your service.

Minimize DNS Lookup

Sorry, it's not my fault again.

Combine external CSS

Yeah, I would be happy to do so but one style is for print media and the other is for the screen. I know, I could embed the media type directly in the CSS definition, but also you could understand they are here for different purposes.

In conclusion, 3 of 4 Google suggestions depends Google itself. Has anyone here noticed a similar behavior?