Yes, 25 on a Mac can be very slow. I haven't updated to 26 yet, but from what I understand the speed issues were corrected in the new version. Download the demo and try for yourself.

I just discovered Low Resolution Mode; which has been a huge boost in performance, 1000% better.

Yes, it’s disappointing, but it makes a difference.

FWIW, here is a list of improvements MM has made in version 26, which I can recommend highly.

Mac performance enhancements

⦁ macOS 10.14. Finale has been updated to be fully compatible with macOS 10.14.

⦁ Scrolling. Horizontal and vertical scrolling speed in Scroll View, Studio View, and Page View has been improved. Stability when using the trackpad to scroll has also been improved.

⦁ Selecting. The lag time associated with selecting a measure on a high-resolution monitor has been reduced. 

⦁ Images. The background and paper images have been optimized for high-resolution monitors. 

⦁ Copying. The time it takes to paste measures, especially multiple times, has improved. 

⦁ Icons. Simple Entry and Smart Shape toolbar icons have been updated for Retina screens. 

⦁ Smart Shapes. Slow document performance has improved for documents with a significant number of Smart Shapes. 

⦁ Transposition. Speed when transposing a selected region of music has improved in high-resolution mode. 

⦁ Fonts. Bold fonts display correctly on high-resolution monitors. 

⦁ Speedy Entry. Note entry delay when using Speedy Entry on high-resolution Macs has been addressed. 

⦁ Simple Entry. Lag when using Simple Entry to adjust a note up or down on high-resolution Macs has been addressed. 

⦁ Editing. Speed when adding, nudging, modifying, and deleting items like lyrics, tuplets, and chords has been improved.