What are the options of reducing tempdb latency?
You've got two basic options.


Reduce the workload required by the tempdb database
Get faster hard drives


As for #1 look for indexes in other databases which are missing.  Fixing missing indexes will cause less spill to the tempdb database which will reduce the workload.

If the applications on the server are using temp tables a lot there's nothing you can do but get faster hard drives.

Now all that said, if the latency problem is on the PFS pages in the tempdb database (you'll need to find the specific page IDs which are having latency issues) then the fix is easy, add more tempdb database files.