A CI/CD pipeline built with CodePipeline and CodeBuild deploys five independent Lambda functions sequentially. An EventBridge rule starts the pipeline immediately when source changes occur. After months of use the pipeline takes too long to finish. What is the best change to speed up the pipeline?

The problem states the pipeline deploys five independent Lambda functions sequentially, causing it to take too long. CodePipeline actions with the same runOrder execute in parallel. By assigning the same runOrder to the deployment actions for the independent Lambda functions, they will deploy concurrently, significantly reducing the overall pipeline execution time. Changing CodeBuild compute types or network throughput primarily affects individual build speeds, not the overall pipeline duration when the bottleneck is sequential execution of independent steps. Building a custom CodeBuild environment for symmetric multiprocessing is not directly applicable to parallelizing independent deployment actions in CodePipeline. Running CodeBuild projects inside a VPC with dedicated instances is an operational change that doesn't inherently parallelize independent deployment steps.