Here’s a method for increasing the performance and speed of your model in Revit MEP.
In the ‘Electrical Settings’ dialogue, under ‘Load Calculations’, you can turn off load calculations for spaces.
Unchecking the ‘Run calculations for loads in spaces’ checkbox will stop Revit from constantly updating these calculations and show the loads as ‘Not Computed’ in the Properties dialog.
As soon as the box is rechecked, the values will be calculated again.
Technical Consultant, A2K Technologies