Slow Connection

we have problem with certain pc when opening the axapta or using the axapta. its taking more than 1 mins to just open a report or to view a report or etc. but others pc are okey… all tis pc was have the same OS, RAM etc… but there are few pc have this problem… whats make this few pc slow…?? we are using 3Tier/LAN(speed=100Gpbs)…