Simple answer, yes a high end brushed ESC will give you better performance from any brushed motor. But you won't be pulling several feet on your fellow racers down the straight, as you will only be getting a fraction of a volt extra power to the motor.
A high end ESC will give you more adjustability, so you could have a smoother or more aggressive power delivery or braking, but the differences are much smaller with a 540. I would recommend a decent brushed ESC, especially over Tamiyas offerings, but if you are looking at buying something like a new Tekin FX-R rather than something cheap off ebay, as Pete says you will get better performance picking a motor from a selection and bedding in the brushes an polishing the bushings than changing the ESC.
Take as much weight as possible out of the chassis (hollow carbon M03 gear shafts for example) and learning to drive smoothly and keep the speed up in the corners so you can gear up for extra speed.
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