diff --git a/platforms/platformio.esp32c5.ini b/platforms/platformio.esp32c5.ini
index 762ab1d..80dbb88 100644
--- a/platforms/platformio.esp32c5.ini
+++ b/platforms/platformio.esp32c5.ini
@@ -9,9 +9,17 @@
 ; https://docs.platformio.org/page/projectconf.html
 
 [env:esp32c5]
-platform = https://github.com/pioarduino/platform-espressif32/releases/download/55.03.30-2/platform-espressif32.zip
+platform = https://github.com/pioarduino/platform-espressif32/releases/download/55.03.35/platform-espressif32.zip
 board = esp32-c5-devkitc-1
 framework = arduino
 
+; PARLIO ISR flags: only set on chips with the PARLIO peripheral (C5/C6/H2/P4).
+; Without these the FastLED PARLIO TX ISR sits in flash and takes cache-miss
+; stalls during execution, silently corrupting LED protocol timing.
+; See FastLED src/platforms/esp/32/drivers/parlio/ for the canonical chipset list.
+build_flags =
+  -DCONFIG_PARLIO_TX_ISR_HANDLER_IN_IRAM=1
+  -DCONFIG_PARLIO_TX_ISR_CACHE_SAFE=1
+
 lib_deps =
-  FastLED
\ No newline at end of file
+  FastLED
diff --git a/platforms/platformio.esp32c6.ini b/platforms/platformio.esp32c6.ini
index 7dfd8f2..c593d3c 100644
--- a/platforms/platformio.esp32c6.ini
+++ b/platforms/platformio.esp32c6.ini
@@ -10,13 +10,10 @@
 
 
 [env:esp32c6] ; the esp32c6 part can be renamed to anything you want.
-; Note that this special platform override is used to bring in the
-; idf5.1 toolchain that is now included in Arduino 2.3.1+, and may
-; not be necessary in the near future.
-platform = https://github.com/pioarduino/platform-espressif32/releases/download/51.03.04/platform-espressif32.zip
+platform = https://github.com/pioarduino/platform-espressif32/releases/download/55.03.35/platform-espressif32.zip
 framework = arduino
-; This is a popular ESP32-S3 board.
 board = esp32-c6-devkitc-1
+board_build.partitions = huge_app.csv
 
 upload_protocol = esptool
 monitor_speed = 115200
@@ -29,8 +26,14 @@ monitor_filters =
 	default
 	esp32_exception_decoder
 
-; ---- CRITICAL: enable USB CDC serial ----
+; PARLIO ISR flags: only set on chips with the PARLIO peripheral (C5/C6/H2/P4).
+; Without these the FastLED PARLIO TX ISR sits in flash and takes cache-miss
+; stalls during execution, silently corrupting LED protocol timing.
+; See FastLED src/platforms/esp/32/drivers/parlio/ for the canonical chipset list.
 build_flags =
+    -DCONFIG_PARLIO_TX_ISR_HANDLER_IN_IRAM=1
+    -DCONFIG_PARLIO_TX_ISR_CACHE_SAFE=1
+    ; ---- CRITICAL: enable USB CDC serial ----
     -D ARDUINO_USB_CDC_ON_BOOT=1
     -D ARDUINO_USB_MODE=1
 
diff --git a/platforms/platformio.esp32h2.ini b/platforms/platformio.esp32h2.ini
index dedd82c..fe4708f 100644
--- a/platforms/platformio.esp32h2.ini
+++ b/platforms/platformio.esp32h2.ini
@@ -9,9 +9,17 @@
 ; https://docs.platformio.org/page/projectconf.html
 
 [env:esp32h2]
-platform = https://github.com/pioarduino/platform-espressif32/releases/download/53.03.10/platform-espressif32.zip
+platform = https://github.com/pioarduino/platform-espressif32/releases/download/55.03.35/platform-espressif32.zip
 board = esp32-h2-devkitm-1
 framework = arduino
 
+; PARLIO ISR flags: only set on chips with the PARLIO peripheral (C5/C6/H2/P4).
+; Without these the FastLED PARLIO TX ISR sits in flash and takes cache-miss
+; stalls during execution, silently corrupting LED protocol timing.
+; See FastLED src/platforms/esp/32/drivers/parlio/ for the canonical chipset list.
+build_flags =
+  -DCONFIG_PARLIO_TX_ISR_HANDLER_IN_IRAM=1
+  -DCONFIG_PARLIO_TX_ISR_CACHE_SAFE=1
+
 lib_deps =
-  FastLED
\ No newline at end of file
+  FastLED
diff --git a/platforms/platformio.esp32p4.ini b/platforms/platformio.esp32p4.ini
new file mode 100644
index 0000000..7b81f03
--- /dev/null
+++ b/platforms/platformio.esp32p4.ini
@@ -0,0 +1,27 @@
+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp32p4]
+platform = https://github.com/pioarduino/platform-espressif32/releases/download/55.03.35/platform-espressif32.zip
+board = esp32-p4-evboard
+framework = arduino
+board_build.partitions = huge_app.csv
+
+; PARLIO ISR flags: only set on chips with the PARLIO peripheral (C5/C6/H2/P4).
+; Without these the FastLED PARLIO TX ISR sits in flash and takes cache-miss
+; stalls during execution, silently corrupting LED protocol timing.
+; See FastLED src/platforms/esp/32/drivers/parlio/ for the canonical chipset list.
+build_flags =
+  -DCONFIG_PARLIO_TX_ISR_HANDLER_IN_IRAM=1
+  -DCONFIG_PARLIO_TX_ISR_CACHE_SAFE=1
+  -DARDUINO_USB_MODE=1
+
+lib_deps =
+  FastLED