The government says there were 163 investigations into the capability of public sector workers at the start of the financial year.
The Public Services Commission's annual report is due to be laid before Tynwald this month.
In it, the commission outlines staff issues across the civil service and other parts of the Island public services - including healthcare, the police and fire and rescue service.
In its report, it says at the end of March, 143 investigations were taking place over attendance issues, and another 20 looking into performance.
The commission says it recorded 57 ongoing disciplinary cases at the end of May, and another 14 grievance procedures among public servants.
It also revealed people suspended on full pay during investigations are off for an average of 17 weeks - at an estimated cost of almost £11,400 each.
However, a new team of investigating officers have now been employed, and the commission says it hopes that will speed up the investigation process and reduce suspension times.
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