What is the difference between a stresser-free DDoS attack and a volumetric DDoS attack?

Volumetric DDoS attacks aim to overwhelm the target with large amounts of traffic, while stresser-free attacks focus on causing performance degradation or delays. Volumetric attacks saturate the network bandwidth, making the service unavailable. Stresser-free attacks aim for a more subtle, yet persistent, impact on performance, potentially causing delays or slowdowns.