Bacause i made other two restarts and time remains high... not so high as the first but took always more than an hour in the second and third restart.
On that pc there are also other 4 staking coin wallets, so probably a little overloaded....
Next week ram will be updated to 8Gb. and i will see if the startup performances remains the same or improve.
Thanks.
Buy a SSD, it's the best investment in order to have a faster time loading for the wallets. I have also one and compared to the old HDD it's 10 time faster