It just places .gz files which can be loaded by that Nginx module, or any other webserver which supports a similar feature.

Coincidentally I am using that Nginx module on Windows :)

vsa-chatbox is really slowly to load now... And I'm always connected to the chat not "default not logged in"

another trouble with VSA mods: Advanced Forum Rules

The timer doen't goes

Don't know if this has been reported but when the MOD is enabled the "New Groups" column on the groups page shows for a second and then disappears. And the column on the blog page (with the three tabs - recent entries, most popular, best blogs) gets pushed to the right. By the way, this is happening in Safari 4 and not IE8.

Setting the "Enable Javascript Optimiser" to NO fixes the problem, but lost some page refresh speed.

Installed, made a huge difference along with accompanying suggestions. YSlow shows this as well as the feel from my end. My only question is about this "Grade F on Add Expires headers" I would appreciate suggestions on how to change that.

TIA!

Is this mod like VB optimize for 3.84 ?

No, that does something completely different and separate (I run both). Also it works on 4.0:

https://vborg.vbsupport.ru/showthread.php?t=237325

It depends on your web server - google around a bit

What is the best way to understand the page load times with and without this mod? I have firefox and firebug if those provide any benefit.

Conflit with VSA Advanced Forum Statistics.
Only show "loading..." (Need to turn off Javascript Optimizer).