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AWS instances include an ephemeral NVMe drive alongside your EBS (GP3) volume. Because it’s ephemeral, the drive is intended for caching or interruptible tasks — not persistent storage.
Data on the NVMe drive is lost when the instance terminates. If you’re using a spot instance, this can happen at any moment without warning.

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The problem

When your GP3 volume is warming up, it can feel slow and nearly unusable. Most workloads tolerate this, but games or workflows that depend on fast storage will notice the impact during this period.

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Solution

You can place the NVMe drive in front of your EBS volume as a caching layer. Reads and writes hit the faster NVMe first, reducing the friction caused by GP3 warm-up. The tested approach uses software called PrimoCache. PrimoCache is not free permanently, but it provides the storage boost needed to make the setup practical.
This guide will be expanded with more detailed setup steps in a future update.