Our main new result is to show how to securely combine the techniques used in FROST and SPRINT, allowing one to build a threshold Schnorr signing protocol that (i) is secure and robust without synchrony assumptions (like SPRINT), (ii) provides security even with an unlimited number of presignatures, and (assuming unused presignatures are available) signing requests can be processed concurrently with minimal latency (like FROST), (iii) achieves high throughput (like SPRINT), and (iv) achieves optimal resilience.