PKG not properly aligned to HDD sectors or slow internal drive. Fix: Use MultiMAN’s "Verify PKG" tool. If errors appear, the download is bad. Alternatively, replace your internal HDD with a 7200 RPM drive or SSD.
Rebuild your PS3 database. Turn off your console, enter Recovery Mode by holding down the power button until you hear two consecutive beeps, and select Rebuild Database . This optimizes file locations on your hard drive without deleting your saved data. Maximizing Performance Post-Installation
Rebuild your PS3 database via Recovery Mode, or reinstall the split PKG parts. Maximizing Performance Post-Fix