On some systems where a significant number of custom fonts are available (e.g. you've Adobe tools installed) the first time you drop on Content panel an item containing a text (say a Button) it can take a significant time before Scene Builder gives hand back (5 to 15 seconds).

2014-01-21 16:54:17.784 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Apple Casual" and got font with PostScript name "AppleCasual". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:17.785 java[43580:d07] CoreText performance note: Set a breakpoint on CTFontLogSuboptimalRequest to debug.
2014-01-21 16:54:17.900 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Charcoal CY" and got font with PostScript name "CharcoalCY". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:18.062 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Courier Bold" and got font with PostScript name "Courier-Bold". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:18.116 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Courier Bold Oblique" and got font with PostScript name "Courier-BoldOblique". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:18.120 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Courier Oblique" and got font with PostScript name "Courier-Oblique". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:18.314 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Geneva CY" and got font with PostScript name "GenevaCyr". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:18.679 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica Light Oblique" and got font with PostScript name "Helvetica-LightOblique". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:18.778 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica Light" and got font with PostScript name "Helvetica-Light". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:18.888 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica Bold Oblique" and got font with PostScript name "Helvetica-BoldOblique". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:18.940 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica Bold" and got font with PostScript name "Helvetica-Bold". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:18.949 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica Oblique" and got font with PostScript name "Helvetica-Oblique". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:18.977 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica CY BoldOblique" and got font with PostScript name "HelveticaCY-BoldOblique". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:19.040 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica CY Plain" and got font with PostScript name "HelveticaCY-Plain". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:19.075 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica CY Oblique" and got font with PostScript name "HelveticaCY-Oblique". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:19.117 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica CY Bold" and got font with PostScript name "HelveticaCY-Bold". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:19.139 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica Neue Medium" and got font with PostScript name "HelveticaNeue-Medium". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:19.332 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica Neue Light Italic" and got font with PostScript name "HelveticaNeue-LightItalic". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:19.336 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica Neue Condensed Black" and got font with PostScript name "HelveticaNeue-CondensedBlack". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:19.341 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica Neue Light" and got font with PostScript name "HelveticaNeue-Light". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:19.345 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica Neue UltraLight" and got font with PostScript name "HelveticaNeue-UltraLight". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:19.436 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica Neue Thin Italic" and got font with PostScript name "HelveticaNeue-ThinItalic". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:19.494 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica Neue Bold Italic" and got font with PostScript name "HelveticaNeue-BoldItalic". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:19.504 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica Neue Italic" and got font with PostScript name "HelveticaNeue-Italic". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:19.533 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica Neue UltraLight Italic" and got font with PostScript name "HelveticaNeue-UltraLightItalic". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:19.538 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica Neue Bold" and got font with PostScript name "HelveticaNeue-Bold". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:19.602 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica Neue Thin" and got font with PostScript name "HelveticaNeue-Thin". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:19.611 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica Neue" and got font with PostScript name "HelveticaNeue". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:19.644 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica Neue Condensed Bold" and got font with PostScript name "HelveticaNeue-CondensedBold". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:19.647 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Helvetica Neue Medium Italic" and got font with PostScript name "HelveticaNeue-MediumItalic". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:21.472 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Times Roman" and got font with PostScript name "Times-Roman". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:21.664 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Times Italic" and got font with PostScript name "Times-Italic". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:21.688 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Times Bold" and got font with PostScript name "Times-Bold". For best performance, only use PostScript names when calling this API.
2014-01-21 16:54:21.693 java[43580:d07] CoreText performance note: Client called CTFontCreateWithName() using name "Times Bold Italic" and got font with PostScript name "Times-BoldItalic". For best performance, only use PostScript names when calling this API.