LL on Core2 duo Intel with 4g RAM should run very fast. Much faster then Windows 7. Read the release notes. There are suggestions regarding Vbox there that will speed up boot. Also network connections could be slowing you down too and poorly configured PCI devices. You need to post hardware information and what specifically seems slow. Also, I'm just guessing, but if your native language is Spanish Moltke who is very capable should be able to help you in the Spanish section of the forum.
TC