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Reducing number of MTLRenderEncoders that get created per render pass
Reducing the number of drawPrimitives calls by batching data whenever possible
Using setNeedsDisplay flag of MTLLayer and updating the layer content on AppKit thread in a callback

Current numbers from RenderPerfTest (OGL vs Metal):

Bench	OGL	Metal
FlatOval(AA)	59(18)	52(1)
FlatBox	90	93
Image(AA)	94(90)	87(89)
RotatedBox	91	93
RotatedOval(AA)	64(20)	65(2)
LinGradRotatedOval	28	54
WiredBubbles(AA)	41(14)	41(1)
WiredBox	91	96
Lines	88	93
FlatQuad(AA)	65(10)	0
WiredQuad(AA)	48(14)	53(1)
TextNoAA	61	1
TextLCD	70	1
TextGray	82	1