as i can see from the source ( 115 ) the whole menu-tree for the user-sketchbook is rebuild
everytime i press save / save-as:

Editor.java:
sketchbook.rebuildMenus();

this is really slow on os-x (with large sketchbook) ... maybe there could be a preference option
to skip that step? or the method could just add / change the newly modified sketch.

complain to apple for making a crappy java vm. ;)

it should only be happening when the sketch name changes, i'll look into it.

true. i think my system (10.4 / 1.25ghz G4) is probably the worst-case scenario at the
moment.

i checked the time it takes to save ... it's between 1-2 secs. so, maybe this is related to the
"tabs getting dirty / need save" bug (#328) since it's doing unneeded saves.

and thanks for looking into it.

fixed this specific issue for 0125.

there's still general slowness with the sketchbook rebuild that needs to be
fixed, that's filed as bug #579.