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The syntax-directed synthesis paradigm has shown to be a powerful synthesis approach. However, its control-driven nature results in significant performance overhead. Some methods to reduce this overhead include peephole optimisations, control resynthesis and component optimisations. This work explores new methods of improving the performance of syntax-directed synthesised asynchronous circuits, using the Balsa synthesis system as the research framework. This includes investigating description styles and the usage of language constructs that exploit the directness of the synthesis method to obtain more concurrent and faster circuits. The techniques and optimisations presented here has been tested in a set of non-trivial examples including a 32-bit processor, a Viterbi decoder, and a channel-sliced wormhole router.