Short Query Acceleration (SQA) will speed up the execution of short running queries. It does this by selecting certain queries to jump the queue. This can be useful when your cluster runs a mixture of big and small queries. In this case, a small query that would otherwise queue up behind a longer query will execute first.
SQA is enabled by default on Amazon Redshift clusters.But using SQA without any other adjustments to your cluster is not a recipe for success. There are other levers to pull first. And then SQA becomes one part of your performance tuning strategy. See our quick guide to using Short Query Acceleration and WLM for Amazon Redshift for faster queries.