Only able to travel at 14-15 knots rather than the normal 18 knots
The Ben-my-Chree is currently having to operate its engines at less than half its usual capacity.
It's because of energy efficiency restrictions that have been placed on the vessel.
The treasury minister has been responding to a question in the House of Keys.
Dr Alex Allinson says its hoped the impact on sail times - if it was needed - would be minimal:
Assisted Dying Bill is compliant with European human rights laws, insists mover
Campaigner is threatening legal action if the legislation is enacted
Cervical screening still important despite promising new study
Local charity reacts to results of study funded by Cancer Research UK
Local charity now registered for medical operations
Hyperbaric Chamber Facility plans to soft launch later this year
Douglas Council to keep non-Christmas lights up until February
Local authority says it can have a 'positive' impact on residents' wellbeing