pZLib version 2 (Fastest zlib/deflate precompressor)

[ImmortalArc]

Help me people with few question......

1. What's the difference between pzlib plz4 and reflate why in some games pzlib can't find good zlib streams as reflate.
2. I used lzma it consumes my 90% of my CPU power but when I extract it it caused me 90% copy uses again but when I used lzma 4x4 or causes 100% cpu with good results speed when I extracted it it causes me only 50% cpu uses why??
3. How to extract password protected archive without password which I don't know. Compressed with freearc
4. How to decompress data without using to much memory and CPU I want to keep memory usage about 1-2 g and 50%of cpu usage lc and id dirty up the compression.
5 what is Delta is it good to use?
6. It's the any latest version of srep. Is there any latest version of lzma and it's there any best alternative of lzma with good things.