DVD RAM writing is slow



I own a LG GSA 4120B DVD RAM Recorder,
and im using the A111 official frimware
when im trying to see details about the dvdram disc
nero finds x3 writing as possible (the dvdram disc is maxell 4.7 that supports x3 writing)
now, when i copy a 700mb file to the DVDRAM… the copy is really slow…
and in the progress window mentioned the time left and its like… 55min left
then it goes to 40±…

my friend own a LG GSA 4082B… i tried to copy something @ his place and
it took about 10mins for a 500mb file… even less

does any of you have an ideas?