It uses just four stack level... :) By the way, I guess your original was 131072, but man, the stack gets very hot after this time delay, isn't? > Delay131072 call Delay4 > Delay114688 call Delay16384 > Delay98304 call Delay16384 > Delay81920 call Delay16384 > Delay65536 call Delay16384 > Delay49152 call Delay16384 > Delay32768 call Delay16384 > Delay16384 call Delay2048 > Delay14336 call Delay2048 > Delay12288 call Delay2048 > Delay10240 call Delay2048 > Delay8192 call Delay2048 > Delay6144 call Delay2048 > Delay4096 call Delay2048 > Delay2048 call Delay256 > Delay1792 call Delay256 > Delay1536 call Delay256 > Delay1280 call Delay256 > Delay1024 call Delay256 > Delay768 call Delay256 > Delay512 call Delay256 > Delay256 call Delay32 > Delay224 call Delay32 > Delay192 call Delay32 > Delay160 call Delay32 > Delay128 call Delay32 > Delay96 call Delay32 > Delay64 call Delay32 > Delay48 call Delay32 > Delay32 call Delay4 > Delay28 call Delay4 > Delay24 call Delay4 > Delay20 call Delay4 > Delay16 call Delay4 > Delay12 call Delay4 > Delay8 call Delay4 > Delay4 return