diff --git a/Makefile b/Makefile
index fb6ace212..4c1d03087 100644
--- a/Makefile
+++ b/Makefile
@@ -34,7 +34,7 @@ SUBMAKE := $(MAKE) --print-directory
 .SUFFIXES:
 
 BUILDFLAGS := --release --strip
-DEVFLAGS :=
+DEVFLAGS := $(BUILDFLAGS)
 RUNFLAGS :=
 CHECKABLE_PY := pylib qt
 CHECKABLE_RS := rslib
diff --git a/README.development b/README.development
index da92684af..48854e542 100644
--- a/README.development
+++ b/README.development
@@ -61,17 +61,6 @@ folder.
 
 Use 'make clean' to remove some generated files.
 
-Performance
-------------
-
-'make run' builds the Rust libraries in unoptimized debug mode by default.
-Before doing any performance testing, please make sure you make a release
-build with 'make build' and install the resulting .whl files, or use
-make run with the following command:
-
-touch rspy/src/lib.rs
-make run DEVFLAGS="--release --strip"
-
 PyQt
 -----