If I remember correctly, Pagespeed is intelligent about considering the number of concurrent HTTP connections a browser will allow to a particular host. In our case, it didn't start combining Javascript files until we were requesting enough CSS/JS assets to require more than (I think) 6 concurrent requests.
I'm not certain this is right, but you can verify it easily: deliberately split your CSS into more files to see if you can hit the threshold for combining.
Please report back - I'd be interested to hear whether you see the same behaviour.
Stephen
On Thursday, 25 October 2012 10:49:14 UTC+1, erikf154 wrote:
We're hosting an app on GAE which is using the pagespeed service (PSS). PSS does a great job, however, it doesn't combine the stylesheet. CombineCss is enabled by default. I've tried adding the rewriter under enabled_rewriters in app.yaml too, but that doesn't make a difference either. Any clues?
Thanks