diff --git a/Cargo.toml b/Cargo.toml
index 4c1da5b27..2b529ff4e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -123,7 +123,7 @@ strip = false
 lto = "fat"
 incremental = true
 #panic = "abort" # Remove panic output, which can reduce file size
-#opt-level = 1  # z,s: Optimize for size instead of performance; 1 for easier debugging
+opt-level = "s"  # z,s: Optimize for size instead of performance; 1 for easier debugging; comment out for "best performance" (but in Rust 1.72 this causes regressions)
 
 # prefer hardware-accelerated versions of services
 [patch.crates-io.sha2]