-D DISABLE_DIAGNOSTIC_OUTPUT this one will make GxEPD less verbose ;)

variants/mesh_pocket/platformio.ini

@@ -20,6 +20,7 @@ build_flags =  ${nrf52_base.build_flags}
   -D EINK_X_OFFSET=0
   -D EINK_Y_OFFSET=10
   -D DISPLAY_CLASS=GxEPDDisplay
+  -D DISABLE_DIAGNOSTIC_OUTPUT
 build_src_filter = ${nrf52_base.build_src_filter}
   +<helpers/*.cpp>
   +<../variants/mesh_pocket>