mac is really slow to read external drive

hello, i have a late 2012 mac book pro and a seagate 1tb paasport external drive.when i connect my drive to my computer sometimes it takes very long to read the drive right now its going on 5+ minutes and i still cant access my info.i have tested the harddrive on other computers and it boots up instantly or almost instantly.i have also noticced the slowness from time to time when i connect any type of flashdrive or cd wich again seem to work fine on any other device but tend to sometimes not boot up on my computer.is there any fix or possible way to speed up this process ? any recommendations? your help and or suggestions would be highly apprecciated since i do rely on this equipment for work.