The maximum size of a CircleCI configuration file(config.yml) is 3MB. When this limit is exceeded, customers may see errors such as "Unexpected exception processing config" or "An compiled config YAML must be at most 3MB" or "Error: Your config (including expanded orbs) is too large. Please contact support." in their build logs
It is important to remember that this is the compiled configuration. This is the result of expanding any YAML anchors and aliases as well as expanding any included Orbs.