diff --git a/pio-scripts/lto.py b/pio-scripts/lto.py
new file mode 100644
index 0000000000..f6e7cab5dd
--- /dev/null
+++ b/pio-scripts/lto.py
@@ -0,0 +1,24 @@
+Import('env')
+
+env.Replace(AR=env['AR'].replace('elf-ar', 'elf-gcc-ar'))
+env.Replace(RANLIB=env['RANLIB'].replace('elf-ranlib', 'elf-gcc-ranlib'))
+
+# Something later clobbers AR & RANLIB, so until https://github.com/platformio/platform-espressif32/pull/1329
+# is available, wrap the replace function to protect them
+
+# Save a reference to the original env.Replace()
+original_replace = env.Replace
+
+def create_replace_wrapper(env):
+    def replace_wrapper(**kw):
+        if 'AR' in kw:
+            kw.pop("AR")
+        if 'RANLIB' in kw:
+            kw.pop("RANLIB")
+
+        original_replace(**kw)
+    
+    return replace_wrapper
+
+# Replace the env.Replace with the wrapper
+env.Replace = create_replace_wrapper(env)
diff --git a/platformio.ini b/platformio.ini
index 6306595a29..3a1eb4c9ea 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -59,6 +59,7 @@ platform_packages = platformio/framework-arduinoespressif8266
 # esp8266 : see https://docs.platformio.org/en/latest/platforms/espressif8266.html#debug-level
 # esp32   : see https://docs.platformio.org/en/latest/platforms/espressif32.html#debug-level
 # ------------------------------------------------------------------------------
+# Enabling debug? You might want to disable LTO to avoid call stacks being squashed through inlining
 debug_flags = -D DEBUG=1 -D WLED_DEBUG
   -DDEBUG_ESP_WIFI -DDEBUG_ESP_HTTP_CLIENT -DDEBUG_ESP_HTTP_UPDATE -DDEBUG_ESP_HTTP_SERVER -DDEBUG_ESP_UPDATER -DDEBUG_ESP_OTA -DDEBUG_TLS_MEM ;; for esp8266
   # if needed (for memleaks etc) also add; -DDEBUG_ESP_OOM -include "umm_malloc/umm_malloc_cfg.h"
@@ -103,11 +104,16 @@ build_flags =
   -D DECODE_LG=true
   -DWLED_USE_MY_CONFIG
 
+lto_flags =
+  -flto
+
 build_unflags =
+  -fno-lto
 
+# No LTO for ESP8266 as we overflow IRAM
 build_flags_esp8266 = ${common.build_flags}  ${esp8266.build_flags}
-build_flags_esp32   = ${common.build_flags}  ${esp32.build_flags}
-build_flags_esp32_V4= ${common.build_flags}  ${esp32_idf_V4.build_flags}
+build_flags_esp32   = ${common.build_flags}  ${esp32.build_flags}         ${common.lto_flags} 
+build_flags_esp32_V4= ${common.build_flags}  ${esp32_idf_V4.build_flags}  ${common.lto_flags} 
 
 ldscript_1m128k = eagle.flash.1m128.ld
 ldscript_2m512k = eagle.flash.2m512.ld
@@ -121,6 +127,7 @@ extra_scripts =
   post:pio-scripts/strip-floats.py
   pre:pio-scripts/user_config_copy.py
   pre:pio-scripts/build_ui.py
+  pre:pio-scripts/lto.py
 
 # ------------------------------------------------------------------------------
 # COMMON SETTINGS:
@@ -198,6 +205,7 @@ build_flags =
   ; decrease code cache size and increase IRAM to fit all pixel functions
   -D PIO_FRAMEWORK_ARDUINO_MMU_CACHE16_IRAM48 ;; in case of linker errors like "section `.text1' will not fit in region `iram1_0_seg'"
   ; -D PIO_FRAMEWORK_ARDUINO_MMU_CACHE16_IRAM48_SECHEAP_SHARED ;; (experimental) adds some extra heap, but may cause slowdown
+  
 
 lib_deps =
   #https://github.com/lorol/LITTLEFS.git
diff --git a/wled00/wled00.ino b/wled00/wled00.ino
index 866543ab93..50e6561429 100644
--- a/wled00/wled00.ino
+++ b/wled00/wled00.ino
@@ -12,10 +12,12 @@
  */
 #include "wled.h"
 
+void setup() __attribute__((used));
 void setup() {
   WLED::instance().setup();
 }
 
+void loop() __attribute__((used));
 void loop() {
   WLED::instance().loop();
 }