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:
Island's first rapid EV charger being installed
Once operational, the site will retain its existing charger, increasing overall capacity to four charging bays
Mooir Vannin could be first of many
Dr Alex Allinson, who is retiring as Ramsey MHK at this year's general election, gave evidence to the final hearing by the independent panel.
'Significant investment or redevelopment' needed at Ramsey District Cottage Hospital
Manx Care is 'planning a sustainable long-term solution'
Braddan Commissioners open expressions of interest for TT camping at Roundhouse
Local authority wants to provide family friendly accommodation