AWS Lambda Web Functions keep billing memory ~7 minutes after the last request

AWS Lambda Web Functions continue billing memory for 5–7 minutes after requests complete, with memory charges accounting for approximately 88% of total compute costs in testing, prompting the company Easel to build its own compute infrastructure instead. Easel's custom solution delivered 1.5–3× faster response times for warm requests and 3.5× faster cold starts, making it more cost-effective for applications with unpredictable traffic patterns.