@feiercrack: You might wanna use 64bit Java/JDownloader, see
https://jdownloader.org/jdownloader2
backup the complete cfg folder and later restore it (do not merge but replace the new one)
In many testings I could not reproduce any significant speed difference. JDownloader uses 7zipjbindinding which uses original sources of 7zip and unrar.
Can you please provide more details about different extraction times? What archive type? what are your meassured times?