[ANSWERED] Very large final ISO

I have installed 8.1 Pro with U1 x64 in VirtualBox. Next, using WinReducer 1.06, I tried to remove some unnecesary components (natural language, speech, drivers). Also I checked Clean backup WinSXS, remove other versions. After ~6hours, size of final output image was 6GB... What's wrong?

Just checking if you still need help with this problem?

If you do, please grab the latest version of WinReducer and we'll see if we can help.