diff --git a/platformio_core_defs.ini b/platformio_core_defs.ini
index 23db5e0c3..9713c0d40 100644
--- a/platformio_core_defs.ini
+++ b/platformio_core_defs.ini
@@ -231,7 +231,7 @@ build_flags                 = -DESP32_STAGE
                               -include "esp32x_fixes.h"
                               -DUPDATE_NOCRYPT 
                               -Os
-                              -finline-functions-called-once
+;                              -finline-functions-called-once
 ;                              -Wnull-dereference
                               -DNO_GLOBAL_ESP_NOW
                               -DNO_GLOBAL_EEPROM
@@ -247,6 +247,11 @@ build_flags                 = -DESP32_STAGE
                               -mstrict-align
                               -DUSE_WEBCLIENT_HTTPS
                               -DFEATURE_TLS=1
+                              ; use of ROM SHA routines is automatically disabled for IDF version earlier v5.5.4
+                              ;-DUSE_SHA_ROM
+                              ;for TLS we can afford compiling for 4K RSA keys
+                              -DUSE_4K_RSA
+                              -DARDUINO_LOOP_STACK_SIZE=12288
 
 lib_ignore                = BLE
                             Zigbee