diff --git a/platformio.ini b/platformio.ini
index 9cc3b3d7..20e64c4f 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -1270,11 +1270,12 @@ build_flags =
 build_flags =
   -O2 ;; optimize for performance instead of size
   ;-ffast-math ;; gives a few  (2-5) percent speedup on ESP32-S3, but causes slight slowdown on classic ESP32
-  -funsafe-math-optimizations -fsingle-precision-constant ;; less dangerous than -ffast-math; still allows the compiler to exploit FMA and reciprocals  (10% faster on -S3)
+  -funsafe-math-optimizations ;; less dangerous than -ffast-math; still allows the compiler to exploit FMA and reciprocals  (10% faster on -S3)
   ;; -mtarget-align ;; this one is included in -O2, so its not necessary to explicitly add it
   -free -fipa-pta ;; these are very useful, too
   -fno-jump-tables -fno-tree-switch-conversion                 ;; needed
   -freorder-blocks -Wwrite-strings -fstrict-volatile-bitfields ;; needed
+build_flags_V4 = ${Speed_Flags.build_flags} -fsingle-precision-constant ;; old framework does not like this flag
 build_unflags =
   -Os ;; to disable standard optimization for size
 
@@ -1659,7 +1660,7 @@ build_flags = ${esp32_4MB_V4_S_base.esp32_build_flags}
   ;; -Wall -Wextra 
   -Wno-unused-value -Wno-format -Wno-type-limits
   -D WLED_RELEASE_NAME=esp32_4MB_V4_HUB75
-  ${Speed_Flags.build_flags}  ;; -O2 -> optimize for speed instead of size
+  ${Speed_Flags.build_flags_V4}  ;; -O2 -> optimize for speed instead of size
   ;; -D DEBUG
   -D WLED_WATCHDOG_TIMEOUT=0 #-D WLED_DISABLE_BROWNOUT_DET
   -D ARDUINO_USB_CDC_ON_BOOT=0 ; needed for arduino-esp32 >=2.0.4; avoids errors on startup
@@ -1731,7 +1732,7 @@ extends = esp32_4MB_V4_S_base
 build_unflags = ${esp32_4MB_V4_S_base.build_unflags}
   ${Speed_Flags.build_unflags}  ;; to override -Os
 build_flags = ${esp32_4MB_V4_S_base.esp32_build_flags}
-  ${Speed_Flags.build_flags}  ;; optimize for speed instead of size
+  ${Speed_Flags.build_flags_V4}  ;; optimize for speed instead of size
   -D WLED_RELEASE_NAME=esp32_16MB_V4_S
   -D WLED_WATCHDOG_TIMEOUT=0 #-D WLED_DISABLE_BROWNOUT_DET
   -D ARDUINO_USB_CDC_ON_BOOT=0 ; needed for arduino-esp32 >=2.0.4; avoids errors on startup
@@ -1834,7 +1835,7 @@ build_flags = ${esp32_4MB_V4_S_base.esp32_build_flags}
   -DARDUINO_EVENT_RUNNING_CORE=0  ;; assign Wifi to core0, to have more CPU on core#1 (arduino loop)
   -DARDUINO_RUNNING_CORE=1        ;; should be default, but does not hurt
   -DCONFIG_MBEDTLS_DYNAMIC_BUFFER=1 ;; optional - seems to move more buffers into PSRAM
-  ;;${Speed_Flags.build_flags}  ;; optimize for speed instead of size --> over 100% flash, but works with 256KB filesystem (alternative partitions file)
+  ;;${Speed_Flags.build_flags_V4}  ;; optimize for speed instead of size --> over 100% flash, but works with 256KB filesystem (alternative partitions file)
   -D WLEDMM_FASTPATH ; WLEDMM experimental option. Reduces audio lag (latency), and allows for faster LED framerates. May break compatibility with previous versions.
   -DBOARD_HAS_PSRAM -D WLED_USE_PSRAM_JSON ;; -D WLED_USE_PSRAM ;; WLED_USE_PSRAM causes major slow-down (slow LEDs) on some ESP32 boards
   ;;-D CONFIG_ESP32_REV_MIN=3  ;;  disables PSRAM bug workarounds in the core, reducing the code size and improving overall performance.
@@ -2020,7 +2021,7 @@ build_flags = ${common.build_flags} ${esp32s3.build_flags} -Wno-misleading-inden
   -DARDUINO_USB_MODE=1 -DARDUINO_USB_CDC_ON_BOOT=0 -DARDUINO_USB_MSC_ON_BOOT=0 -DARDUINO_USB_DFU_ON_BOOT=0   ;; for Serial-to-USB chip
   ;;-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
   ;;-D WLED_DISABLE_ADALIGHT     ;; disables serial protocols - recommended for Hardware-CDC USB (Serial RX will receive junk commands when RX pin is unconnected, unless its pulled down by resistor)
-  ${Speed_Flags.build_flags}  ;; optimize for speed instead of size
+  ${Speed_Flags.build_flags_V4}  ;; optimize for speed instead of size
   -D WLEDMM_FASTPATH ; WLEDMM experimental option. Reduces audio lag (latency), and allows for faster LED framerates. May break compatibility with previous versions.
   ${common_mm.animartrix_build_flags}
   -D WLED_WATCHDOG_TIMEOUT=0 -D CONFIG_ASYNC_TCP_USE_WDT=0
@@ -2068,7 +2069,7 @@ build_flags = ${common.build_flags} ${esp32s3.build_flags} -Wno-misleading-inden
   -DARDUINO_USB_MODE=1 -DARDUINO_USB_CDC_ON_BOOT=0 -DARDUINO_USB_MSC_ON_BOOT=0 -DARDUINO_USB_DFU_ON_BOOT=1   ;; for Serial-to-USB chip
   ;;-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
   -D WLED_DISABLE_ADALIGHT    ;; disables serial protocols - recommended for Hardware-CDC USB (Serial RX will receive junk commands when RX pin is unconnected, unless its pulled down by resistor)
-  ${Speed_Flags.build_flags}  ;; optimize for speed instead of size
+  ${Speed_Flags.build_flags_V4}  ;; optimize for speed instead of size
   -D WLEDMM_FASTPATH          ;; WLEDMM experimental option. Reduces audio lag (latency), and allows for faster LED framerates. May break compatibility with previous versions.
   ${common_mm.animartrix_build_flags}
   -D WLED_WATCHDOG_TIMEOUT=0 -D CONFIG_ASYNC_TCP_USE_WDT=0