"Is there a way to enable VSync in Storyboard?"
the render_mgr has an option for modifying how often the Storyboard Engine posts per vsync.
the option is:
Specifying a swap interval of 1 means post each vsync, a value of 2 means post every 2 vsyncs, 3 for every 3 vsyncs.
it's a simple way of putting an upper cap on performance or throttling down GPU's work load.
A value of 0 means do not wait for vsync. This option may give some performance boosts, but could also lead to possible screen-tearing.
Of course this is only possible with hardware that supports VSync so make sure to double check your configuration.