Once you have access to actionable data, there’s nothing like a bit of healthy competition to drive performance. Create leaderboards or reports that transparently show how colleagues are getting on and offer prizes or badges for those that are outperforming or forfeits for the individuals that are bottlenecking the hiring process. For example, you could reward the recruiter with the lowest time-to-fill record. Make sure that the gamification element remains friendly to boost morale and productivity rather than creating a stressful environment.
Gamification can also be a very effective technique to encourage employee referrals, which in itself can help improve recruiting efficiency by providing recruiters with a rich source of candidates.