/users/ report is slow

/users reports showing:

• user name list
• number of commits
• number of LoC (optionally)
• number of reviews
  can be slow, a specially when sorting by:
• number of commits
• number of LoC
• number of reviews

Users report can be accessed by:
[fecru]/users
[fecru]/users/[repository]
[fecru]/users/~br=[branch]/[repository]/