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Cheap servers that idle quietly and sprint briefly, perfect for spiky small workloads.
Quick Definition
Burstable instances (such as AWS T-series) provide a baseline level of CPU with the ability to burst higher using accumulated credits. They are cost-effective for workloads with intermittent demand, but sustained high usage can erode credits and trigger extra charges.
Burstable instances are low-cost virtual machines designed for workloads that are mostly idle with occasional spikes. They earn credits while quiet and spend those credits to burst to full speed when needed.
They are a great fit for small websites, dev machines, and background agents, and a poor fit for anything busy all day. A burstable instance that runs out of credits either slows to a crawl or, in unlimited mode, starts billing extra for the sustained burst, sometimes costing more than a regular instance would have.
Example. An internal dashboard sits idle 95 percent of the day. Moving it from a standard instance to a burstable one cuts its cost by 60 percent, and users never notice because the bursts cover every page load.
Choosing the right instance family is half of rightsizing. The Cloud Cost Management guide covers when burstable, standard, and compute-optimized families each win.
When average utilization is low, roughly under 20 to 30 percent, with short spikes. The lower the idle baseline, the bigger the saving.
Performance drops to the baseline rate, or with unlimited mode enabled, you pay extra for continued bursting.
Check its CPU utilization pattern. Long flat low usage with brief peaks fits. Sustained high usage does not.