We have just started using more javascript in the web interface of an internal application(php if it matters). Now that the changes are in place it is becoming very obvious that the more javascript on the page, the slower the page loads through squid.
Any suggestions on why this is happening? I don't want the question to be to vague but I don't want to suggest somthing when I don't know what I'm looking for.
One thing that occurred to me: What if the pages without javascript aren't getting cached, and our squid server is secretly slow? How do I test this?
Please, enlighten me!
Update 1 All of the javascript is cached, and being pulled from the proxy server. The largest chunk data wise (~60k) is the generated html and that is a miss every time.
Update 2 There is no ajax, the javascript is confined to a floating toolbar and handles some text pre-parsing for a search feature, its simple rule based "If it has x many characters look for a matching order number" kind of thing.
Upon closer inspection all the cached javascript is checked if its the newest version before being sent on. Triggering a TCP_REFRESH_HIT/304 I have a feeling this may be my bottleneck.
Best Answer
Inspect your squid access log and look for TCP_HIT. This will tell you what pages are getting delivered from cache vs being forwarded on.