The 11th Symposium on Software Performance (SSP ’20), was held as an online event from November 12 to 13, 2020. Every year, the SSP brings together researchers and practitioners interested in software performance and related quality attributes. The scope of SSP spans measurement, modeling, benchmark design, and run-time management. SSP 2020 was planned to take place in Leipzig, Germany. Unfortunately, due to the Covid-related circumstances, a physical meeting was not possible.