diff --git a/platformio.ini b/platformio.ini
index f296f8382..3cd8e0508 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -19,8 +19,7 @@ monitor_speed = 115200
 lib_deps =
   SPI
   Wire
-  ;jgromes/RadioLib @ ^7.7.1
-  https://github.com/jgromes/RadioLib.git#6d8934836678d8894e3d556550475b37dce3e2b6
+  jgromes/RadioLib @ ^7.8.1
   rweather/Crypto @ ^0.4.0
   adafruit/RTClib @ ^2.1.3
   melopero/Melopero RV3028 @ ^1.1.0
@@ -29,6 +28,15 @@ build_flags = -w -DNDEBUG -DRADIOLIB_STATIC_ONLY=1 -DRADIOLIB_GODMODE=1
   -D LORA_FREQ=869.618
   -D LORA_BW=62.5
   -D LORA_SF=8
+  ; TCXO startup delay in microseconds, written by CustomSX1262/CustomLR1110
+  ; after begin(). RadioLib defaults to 5000 and nothing used to override it, so
+  ; every board paid 5 ms on every duty-cycle wake. Lowest working value measured
+  ; on five modules: T096 400, Tracker V2 300, Waveshare 150, ThinkNode M3 200,
+  ; T1000-E 200 us - 1600 keeps 4x margin over the worst of them. It also feeds
+  ; the RXPS sleep floor and timer guard (transition = this + 1000), so lowering
+  ; it makes low-SF profiles armable that were not. A board needing its own value
+  ; puts -D MC_TCXO_DELAY_US=... in its own build_flags; the later -D wins.
+  -D MC_TCXO_DELAY_US=1600
   -D ENABLE_ADVERT_ON_BOOT=1
   -D ENABLE_PRIVATE_KEY_IMPORT=1   ; NOTE: comment these out for more secure firmware
   -D ENABLE_PRIVATE_KEY_EXPORT=1
@@ -58,6 +66,9 @@ build_src_filter =
 [esp32_base]
 extends = arduino_base
 platform = platformio/espressif32@6.11.0
+; PowerSaving Arduino Core 2.0.17 for low power ESP32 boards
+; https://github.com/IoTThinks/powersaving-arduino-lib
+platform_packages = framework-arduinoespressif32 @ https://github.com/IoTThinks/powersaving-arduino-lib/releases/download/2.0.17/esp32-2.0.17.zip
 monitor_filters = esp32_exception_decoder
 extra_scripts = merge-bin.py
 build_flags = ${arduino_base.build_flags}
@@ -73,8 +84,14 @@ lib_deps =
 ; esp32c6 uses arduino framework 3.x
 ; WARNING: experimental. May not work as stable as other platforms.
 [esp32c6_base]
-extends = esp32_base
+extends = arduino_base
 platform = https://github.com/pioarduino/platform-espressif32/releases/download/53.03.13-1/platform-espressif32.zip
+monitor_filters = esp32_exception_decoder
+extra_scripts = merge-bin.py
+build_flags =
+    ${arduino_base.build_flags}
+    -D ESP32_PLATFORM
+build_src_filter = ${arduino_base.build_src_filter}
 
 ; ----------------- NRF52 ---------------------
 
@@ -92,7 +109,10 @@ build_flags = ${arduino_base.build_flags}
   -D NRF52_PLATFORM
   -D LFS_NO_ASSERT=1
   -D EXTRAFS=1
-  -D USE_CC310_HW_CRYPTO=1
+; CC310 hardware crypto (upstream PR #2824) disabled until its benefit is proven:
+; no measurable current difference on RAK4631 with PowerSaving, and per-call
+; nRFCrypto begin()/end() was questioned in review. Re-enable by uncommenting.
+; -D USE_CC310_HW_CRYPTO=1
 lib_deps =
   ${arduino_base.lib_deps}
   https://github.com/oltaco/CustomLFS#0.2.3
@@ -118,6 +138,7 @@ build_flags = ${arduino_base.build_flags}
   -D STM32_PLATFORM
   -I src/helpers/stm32
   -I $PROJECT_PACKAGES_DIR/framework-arduinoststm32/libraries/SubGhz/src
+  -fpermissive
 build_src_filter = ${arduino_base.build_src_filter}
   +<helpers/stm32>
 lib_deps = ${arduino_base.lib_deps}
@@ -174,6 +195,8 @@ build_src_filter =
   +<../src/Packet.cpp>
   +<../src/helpers/ConfigSerializer.cpp>
   +<../src/helpers/DynamicConfigSerializer.cpp>
+  +<../src/helpers/radiolib/RXPowerSaving.cpp>
+  +<../src/helpers/radiolib/RXPowerSavingCLI.cpp>
 lib_deps =
   google/googletest @ 1.17.0