Don't know how to report to bugzilla, but first of all I want to know if it's only my PC or if you have this problem too.
Today I started copy a 1.4 GByte from an internal disk (NTFS formatted) to a USB stick. The process is extremely slow (but this isn't a news, it always was with previous Fedora versions), in the meanwhile I tried to start Firefox and I found that it doesn't start: from KDE system monitor I see that Firefox starts loading but it blocks in "waiting for disk". Tried with some other program (Ksnapshot, Filezilla) and they're also extremely slow in loading when copy is active.
When putting the copy process in pause, after some time programs starts opening.
Anyone can confirm if this problem isn't only mine?