diff --git a/platformio.ini b/platformio.ini
index 5edc111d..059446b1 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -63,7 +63,7 @@ default_envs =
   esp32S3_8MB_M
   ;; esp32s2_tinyUF2_PSRAM_S  ;; experimental - only for adafruit -S2 boards with tinyUF2 bootloader !!!
   esp32s2_PSRAM_M          ;; experimental
-  esp32c3dev_4MB_M         ;; experimental
+  ;; esp32c3dev_4MB_M         ;; experimental - disabled as github action build has strange problems with this one since today
   seeed_esp32c3_4MB_S      ;; experimental
   esp32_4MB_V4_S           ;; experimental
   esp32_16MB_V4_M          ;; experimental
@@ -1285,7 +1285,7 @@ build_flags = ${esp32_4MB_V4_S_base.build_flags}
   -D WLED_RELEASE_NAME=esp32_4MB_PSRAM_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
-  -D WLED_USE_PSRAM
+  -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 WLED_DISABLE_LOXONE ;  FLASH 1272 bytes
   -D WLED_DISABLE_HUESYNC ; RAM 122 bytes; FLASH  6308 bytes
   -D WLED_DISABLE_ALEXA ;   RAM 116 bytes; FLASH 13524 bytes
@@ -1309,7 +1309,7 @@ build_flags = ${esp32_4MB_V4_M_base.build_flags}
   -D WLED_RELEASE_NAME=esp32_4MB_PSRAM_M
   -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
-  -D WLED_USE_PSRAM
+  -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 WLED_DISABLE_LOXONE  ;;  FLASH 1272 bytes
   -D WLED_DISABLE_HUESYNC ;;  RAM 122 bytes; FLASH  6308 bytes
   -D WLED_DISABLE_ALEXA ;;     RAM 116 bytes; FLASH 13524 bytes