http://utmalesoldiers.blogspot.com/2013/02/114.html

He compares the click registration delay for various mice, using the Logitech G300 as a reference (that's why faster mice have negative values).
I'd like to see more mice tested like this and I'd also like to know what makes some mice slower than others. Hopefully manufacturers will start paying more attention to this.
And this is from an older test by sousu, which includes some other mice:

(more info here: http://sousuch.web.fc2.com/DIY/mouse_latency/index.html)
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At the bottom of this page you can find another click latency test, done using a different method (bumping two mice together -- see the Addendum for details).

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Addendum:
Anyone who wants to directly compare two mice in a simple way, can use "Mouse Shooting Speed Test" (or "Mouse Click Response Speed Testing Software"), downloadable from here.
Using it is pretty straight forward: bump LMB against RMB of the other mouse.
Note that the left mouse button of either mouse is A and the right mouse button of either mouse is B. So when you switch the mice bumping by L/R buttons, the winner will change from A to B or vice versa (assuming one mouse is always faster than the other with both buttons).
For a more accurate test you should bump the mice at high speed. But use some common sense if you don't want to break something.
Also the accuracy of the test might depend on your specific system (USB ports, software, ...).
He compares the click registration delay for various mice, using the Logitech G300 as a reference (that's why faster mice have negative values).
I'd like to see more mice tested like this and I'd also like to know what makes some mice slower than others. Hopefully manufacturers will start paying more attention to this.
And this is from an older test by sousu, which includes some other mice:
(more info here: http://sousuch.web.fc2.com/DIY/mouse_latency/index.html)
----
At the bottom of this page you can find another click latency test, done using a different method (bumping two mice together -- see the Addendum for details).
----
Addendum:
Anyone who wants to directly compare two mice in a simple way, can use "Mouse Shooting Speed Test" (or "Mouse Click Response Speed Testing Software"), downloadable from here.
Using it is pretty straight forward: bump LMB against RMB of the other mouse.
Note that the left mouse button of either mouse is A and the right mouse button of either mouse is B. So when you switch the mice bumping by L/R buttons, the winner will change from A to B or vice versa (assuming one mouse is always faster than the other with both buttons).
For a more accurate test you should bump the mice at high speed. But use some common sense if you don't want to break something.

Also the accuracy of the test might depend on your specific system (USB ports, software, ...).