First, how much RAM do you have and how much of the uneeded bloatware do you still having running on it? By the way, ALL laptop manufactures load their systems with tons of unnecessary software and the best thing is to do is uninstall it.
As for Lenovo not being good, uh, no. Nobody beats their Thinkpads in build quality, particularly their T series. I know many professionals who swear by Lenova. This is not to say others don't have quality offerings either because they do.
Here is a link to Laptop Mag and comparing yours to other saystems. In some cases it doesn't fair so well but in others it comes out ahead. Note the load times: http://www.laptopmag.com/review/laptops/lenovo-ideapad-y450.aspx?mode=benchmarks