diff --git a/platformio.ini b/platformio.ini
index aef78a858..eaa05a466 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -129,6 +129,9 @@ lib_deps =
 lib_deps =
 	# renovate: datasource=git-refs depName=meshtastic/device-ui packageName=https://github.com/meshtastic/device-ui gitBranch=master
 	https://github.com/meshtastic/device-ui/archive/95483d8c6e28fcda2160161d5d5a8825f729df62.zip
+custom_sdkconfig =
+	# CONFIG_MBEDTLS_INTERNAL_MEM_ALLOC is not set
+	CONFIG_MBEDTLS_EXTERNAL_MEM_ALLOC=y
 
 ; Common libs for environmental measurements in telemetry module
 [environmental_base]
diff --git a/variants/esp32s3/elecrow_panel/platformio.ini b/variants/esp32s3/elecrow_panel/platformio.ini
index 28a4dc248..db682316d 100644
--- a/variants/esp32s3/elecrow_panel/platformio.ini
+++ b/variants/esp32s3/elecrow_panel/platformio.ini
@@ -52,6 +52,10 @@ lib_deps = ${esp32s3_base.lib_deps}
   # renovate: datasource=custom.pio depName=LovyanGFX packageName=lovyan03/library/LovyanGFX
   lovyan03/LovyanGFX@1.2.26
 
+custom_sdkconfig =
+  ${esp32s3_base.custom_sdkconfig}
+  ${device-ui_base.custom_sdkconfig}
+
 [crowpanel_small_esp32s3_base] ; 2.4, 2.8, 3.5 inch
 extends = crowpanel_base
 build_flags =
diff --git a/variants/esp32s3/heltec_v4/platformio.ini b/variants/esp32s3/heltec_v4/platformio.ini
index 185a31187..fcc20d045 100644
--- a/variants/esp32s3/heltec_v4/platformio.ini
+++ b/variants/esp32s3/heltec_v4/platformio.ini
@@ -71,7 +71,6 @@ build_flags =
   -D HAS_TFT=1
   -D MAP_TILES_GREY ; required for 2MB PSRAM
   -D RAM_SIZE=1432
-  -D STBI_ARENA_SIZE=450000
   -D LV_CACHE_DEF_SIZE=0
   -D LV_LVGL_H_INCLUDE_SIMPLE
   -D LV_CONF_INCLUDE_SIMPLE
@@ -137,3 +136,7 @@ lib_deps = ${heltec_v4_base.lib_deps}
   lovyan03/LovyanGFX@1.2.26
   # renovate: datasource=git-refs depName=Quency-D_chsc6x packageName=https://github.com/Quency-D/chsc6x gitBranch=master
   https://github.com/Quency-D/chsc6x/archive/3b2b6cebf3177b3e2c33d06e07909b0b10159516.zip
+
+custom_sdkconfig =
+  ${esp32s3_base.custom_sdkconfig}
+  ${device-ui_base.custom_sdkconfig}
diff --git a/variants/esp32s3/heltec_v4_r8/platformio.ini b/variants/esp32s3/heltec_v4_r8/platformio.ini
index 0d3fd7616..7c195cf82 100644
--- a/variants/esp32s3/heltec_v4_r8/platformio.ini
+++ b/variants/esp32s3/heltec_v4_r8/platformio.ini
@@ -143,4 +143,8 @@ lib_deps = ${heltec_v4_r8_base.lib_deps}
   # renovate: datasource=custom.pio depName=LovyanGFX packageName=lovyan03/library/LovyanGFX
   lovyan03/LovyanGFX@1.2.26
   # renovate: datasource=git-refs depName=Quency-D_chsc6x packageName=https://github.com/Quency-D/chsc6x gitBranch=master
-  https://github.com/Quency-D/chsc6x/archive/3b2b6cebf3177b3e2c33d06e07909b0b10159516.zip
\ No newline at end of file
+  https://github.com/Quency-D/chsc6x/archive/3b2b6cebf3177b3e2c33d06e07909b0b10159516.zip
+
+custom_sdkconfig =
+  ${esp32s3_base.custom_sdkconfig}
+  ${device-ui_base.custom_sdkconfig}
diff --git a/variants/esp32s3/picomputer-s3/platformio.ini b/variants/esp32s3/picomputer-s3/platformio.ini
index e40726da3..064c5f3ff 100644
--- a/variants/esp32s3/picomputer-s3/platformio.ini
+++ b/variants/esp32s3/picomputer-s3/platformio.ini
@@ -69,3 +69,7 @@ build_flags =
 lib_deps =
   ${env:picomputer-s3.lib_deps}
   ${device-ui_base.lib_deps}
+
+custom_sdkconfig =
+  ${esp32s3_base.custom_sdkconfig}
+  ${device-ui_base.custom_sdkconfig}
diff --git a/variants/esp32s3/rak_wismesh_tap_v2/platformio.ini b/variants/esp32s3/rak_wismesh_tap_v2/platformio.ini
index dcbc93040..6b58b22c3 100644
--- a/variants/esp32s3/rak_wismesh_tap_v2/platformio.ini
+++ b/variants/esp32s3/rak_wismesh_tap_v2/platformio.ini
@@ -100,4 +100,7 @@ lib_deps =
   ${env:rak_wismesh_tap_v2.lib_deps}
   ${device-ui_base.lib_deps}
 
+custom_sdkconfig =
+  ${esp32s3_base.custom_sdkconfig}
+  ${device-ui_base.custom_sdkconfig}
 
diff --git a/variants/esp32s3/seeed-sensecap-indicator/platformio.ini b/variants/esp32s3/seeed-sensecap-indicator/platformio.ini
index d34cb655c..6db22f0a1 100644
--- a/variants/esp32s3/seeed-sensecap-indicator/platformio.ini
+++ b/variants/esp32s3/seeed-sensecap-indicator/platformio.ini
@@ -79,3 +79,7 @@ lib_deps =
   ;# renovate: datasource=github-tags depName=bb_captouch packageName=bitbank2/bb_captouch
   ;https://github.com/bitbank2/bb_captouch/archive/refs/tags/1.3.1.zip ; not working
   https://github.com/mverch67/bb_captouch/archive/8626412fe650d808a267791c0eae6e5860c85a5d.zip ; alternative touch library supporting FT6x36
+
+custom_sdkconfig =
+  ${esp32s3_base.custom_sdkconfig}
+  ${device-ui_base.custom_sdkconfig}
diff --git a/variants/esp32s3/t-deck/platformio.ini b/variants/esp32s3/t-deck/platformio.ini
index dadecc92f..be0be7d02 100644
--- a/variants/esp32s3/t-deck/platformio.ini
+++ b/variants/esp32s3/t-deck/platformio.ini
@@ -88,3 +88,7 @@ lib_deps =
   ${env:t-deck.lib_deps}
   ${device-ui_base.lib_deps}
   ;https://github.com/bitbank2/bb_captouch/archive/refs/tags/1.3.1.zip
+
+custom_sdkconfig =
+  ${esp32s3_base.custom_sdkconfig}
+  ${device-ui_base.custom_sdkconfig}
diff --git a/variants/esp32s3/tlora-pager/platformio.ini b/variants/esp32s3/tlora-pager/platformio.ini
index 9b5a8dfa3..3e650171a 100644
--- a/variants/esp32s3/tlora-pager/platformio.ini
+++ b/variants/esp32s3/tlora-pager/platformio.ini
@@ -92,3 +92,7 @@ build_flags =
 lib_deps =
   ${env:tlora-pager.lib_deps}
   ${device-ui_base.lib_deps}
+
+custom_sdkconfig =
+  ${esp32s3_base.custom_sdkconfig}
+  ${device-ui_base.custom_sdkconfig}
diff --git a/variants/esp32s3/unphone/platformio.ini b/variants/esp32s3/unphone/platformio.ini
index edb4fa7b8..c3dc9f03c 100644
--- a/variants/esp32s3/unphone/platformio.ini
+++ b/variants/esp32s3/unphone/platformio.ini
@@ -76,3 +76,7 @@ build_flags =
 lib_deps =
   ${env:unphone.lib_deps}
   ${device-ui_base.lib_deps}
+
+custom_sdkconfig =
+  ${esp32s3_base.custom_sdkconfig}
+  ${device-ui_base.custom_sdkconfig}