I can't either: 

[markh@aurelian ~]$ time sudo dnf install firefox
Last metadata expiration check: 1:27:25 ago on Tue Mar 29 13:44:11 2016.
Package firefox-45.0.1-2.fc23.x86_64 is already installed, skipping.
Dependencies resolved.
Nothing to do.
Complete!

real    0m2.087s
user    0m1.914s
sys     0m0.125s


Maybe a 'dnf clean all' might help with that.


On Tue, Mar 29, 2016 at 3:04 PM, Matthew Miller <mattdm@fedoraproject.org> wrote:
On Tue, Mar 29, 2016 at 10:36:37AM -0700, CLOSE Dave wrote:
> If I run something like, "dnf -y install xxxx", and xxxx is already
> installed, DNF gives a response like the following.
> Last metadata expiration check performed 0:00:02 ago on ...
> Package xxxx is already installed, skipping.
>   ... (long delay, sometimes several minutes) ...
> Dependencies resolved.
> Nothing to do.
> Complete!
>
> That is, it works but it takes an unreasonably long time to do so. How
> can it be that, DNF knows the package is already installed and /still/
> takes such a long time to decide that dependencies are ok? There aren't
> any dependencies to resolve!

I can't replicate this:

  $ time sudo dnf install firefox
  Last metadata expiration check: 2:03:34 ago on Tue Mar 29 12:59:50 2016.
  Package firefox-45.0.1-2.fc23.x86_64 is already installed, skipping.
  Dependencies resolved.
  Nothing to do.
  Complete!

  real  0m1.362s
  user  0m1.197s
  sys   0m0.099s



--
Matthew Miller
<mattdm@fedoraproject.org>
Fedora Project Leader
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