I don't think will help much with executions since that is mainly dependent on latency not the size of the pipe. Latency highly dependent on distance. So only way to overcome that and get better executions is get close to exchange you are trading. My guess is something like google fiber might be marginally better on latency. That being said I want giga but not because will help with trading execution.
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Speed is good but proximity to the execution hub is your main concern and latency of the infrastructure between where you are and where your deals are executed to the exchange. If you're interested in this topic, many brokers offer co-location of your trading system on their servers that bring you right next door to the exchange. Not literally but as close as you can get to DMA (direct market access) as a retail guy, and at a price you can afford.