I'm using Manga Studio 1.5.4 on a Macbook, OS X 10.7.5.
My problem is that the program usually lags significally when I write text in speech bubbles.
There is no problem with any other functions, it's just text.
I would appreciate any suggestions to fix this problem, thanks!
Wow. 1.5.4. My first suggestion would be to update the program. Once you've updated, enter your text on separate layers. One layer per balloon.