diff --git a/Makefile b/Makefile
index d99e115ac..89e3dcb60 100644
--- a/Makefile
+++ b/Makefile
@@ -49,7 +49,7 @@ SUBMAKE := $(MAKE) --print-directory
 .SUFFIXES:
 
 BUILDFLAGS := --release --strip
-DEVFLAGS := $(BUILDFLAGS)
+DEVFLAGS :=
 RUNFLAGS :=
 CHECKABLE_PY := pylib qt
 CHECKABLE_RS := rslib rspy
diff --git a/rspy/Cargo.toml b/rspy/Cargo.toml
index d1eec7fc1..5a7735a0f 100644
--- a/rspy/Cargo.toml
+++ b/rspy/Cargo.toml
@@ -17,3 +17,8 @@ features = ["extension-module"]
 [lib]
 name = "ankirspy"
 crate-type = ["cdylib"]
+
+[profile.dev]
+opt-level = 2
+debug = 0
+codegen-units = 256