My advice to you is - Be patient.
A large table (with large indexes) will take a lot of IO (and time) to
There is much more to it internally than simply transferring a file from
disk to disk and EM does a lot of work 'behind the scenes'.
If you had no problems with the small tables, you should have no problem
with the big ones.
Remember that locks are held during the transfer which might seem to 'hang'
Don't forcefully 'kill' the EM process even if it seems to 'hang' as this
will cause ...