diff --git a/platformio.ini b/platformio.ini
index 20e64c4f..5d5ca8d2 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -2660,8 +2660,10 @@ board_build.flash_mode = qio
 
 build_unflags = ${env:esp32S3_8MB_M.build_unflags}   ;; use the same as "normal" S3 buildenv
   -D ARDUINO_USB_CDC_ON_BOOT=1                       ;; fix warning: "ARDUINO_USB_CDC_ON_BOOT" redefined; comment out for Serial debug
+  ${Speed_Flags.build_unflags}  ;; to override -Os
 build_flags = ${common.build_flags} ${esp32s3.build_flags} -Wno-misleading-indentation -Wno-format-truncation
   ${common_mm.build_flags_S}
+  ${Speed_Flags.build_flags_V4}  ;; -O2 -> optimize for speed instead of size
   -D WLED_RELEASE_NAME=matrixportal_esp32s3
   -D SERVERNAME='"WLED-MatrixPortalS3"'
   ; Serial debug enabled  -DARDUINO_USB_MODE=1 -DARDUINO_USB_CDC_ON_BOOT=1 -DARDUINO_USB_MSC_ON_BOOT=0 -DARDUINO_USB_DFU_ON_BOOT=1 ;; for Hardware-CDC USB mode