How to render text in a CALayer using NSLayoutManager?

I am using the trio of NSLayoutManager, NSTextStorage & NSTextContainer to render text in a layer-backed NSView.

I am under the impression that the view will be more performant if I can override wantsUpdateLayer to return true and thus be using layers more fully. Is this true?

However, all examples I have seen of using NSLayoutManager say that you need to place the following call within drawRect:

layoutManager.drawGlyphsForGlyphRange(glyphRange, atPoint: NSMakePoint(0, 0)) 

How would you perform the equivalent call within updateLayer or some other more layer-oriented place instead?

I created a custom CALayer and overrode the drawInContext method as below:

override func drawInContext(ctx: CGContext!) {
    NSGraphicsContext.saveGraphicsState()

    var nsgc = NSGraphicsContext(CGContext: ctx, flipped: false)
    NSGraphicsContext.setCurrentContext(nsgc)

    NSColor.whiteColor().setFill()
    NSRectFill(NSMakeRect(0, 0, 84, 24))

    lm.drawGlyphsForGlyphRange(glyphRange, atPoint: NSMakePoint(0, 0))  // location of textContainer

    NSGraphicsContext.restoreGraphicsState()

}

This gets the job done, but

1. I'm not sure if there are any performance implications to saving and restoring the graphics context as above.
2. I am unsure how the same would be achieved in the NSView's updateLayer method as that does not have a context to use.