Audio file is loading slowly is a performance issue likely to be the core or the library source - as both are on the same NAS I would try the core at least on a better platform.
I too am in Singapore
See my performance post here Need for speed (v1.2 b165, 64bit, Windows)
PM me and maybe can compare notes…I have a DS1813+ and 713+ but have had similar issues running the core on the 713+ - not yet tried the 1813+ for the record I deemed both platforms to be way under spec for the core to perform