10-15 what? Seconds? Minutes? Hours?
Someone gave me an SSD a few weeks ago and some of my programs still take 10+ seconds to load from it. If you mean 10+ minutes, then run HDTach, Disk Mark or some other software with SMART monitoring and check for failure indicators which may explain the drive's horrible performance. You may also want to run the HDD manufacturer's diagnostic tool just in case. If you haven't run Windows' defragger in a while, that may be worth a shot too.