What is your version? Make sure you use the latest LR 6.3 / CC2015.3
Im use the latest version of cc
Can you tell us what files (size, source) you are exporting and to which format and the export settings? Can you also tell us the time it takes for exporting (pics/min)?
attch here the windows export with all the setting, and window prefernces.
the pic sit in internal hd , and the catalog is in differnrt flash drive.
system ON C also in flash drive
.i just export 100 pic it took :15 MIN
meanwhile my comuter become slowly and i cant work .
i will be very glad for help, because im pro photogrpher and this way i cant work enymore.