Why is "Show uses" sometimes so slow?

[Alexandre Courbot]

On Tue, May 29, 2012 at 5:18 PM, Alexandre Courbot <gnurou at gmail.com> wrote:
> This part of the code looks fun actually. I just wonder what happens
> when the "Show Uses" progress bar is advancing. Milian, would there be
> some documentation somewhere that I failed to see to let me start
> faster on this?

Also noticed yesterday that uses only refer to top contexts (i.e.
source file). If this means every referred top context must be scanned
for matching uses, that may explain why they don't scale satisfyingly
with huge projects like the kernel.

Alex.