when i add lots of files to a composition (for example sources) then it takes very long for xfburn to add them to the composition, leaving the gui unresponsive.
The slowness depends on different factors like your disc speed, CPU, ... That part of the code is to be optimized but after some tests here isn't slower than k3b. Loading 3500 mp3 takes a bit less than 10sec here. However it's true the GUI is unresponsive, i began to work on a progress dialog but ran into some issues and postponed it.
This seems to be fixed in svn, i just added a 10 Gio directory containing many mp3 in subdirectories, it tooks less than 3 seconds. Maybe someone can confirm this ?
It is faster, yes, but while adding the GUI is left unresponsive. Will be fixed before release, accepting bug.
Fixed in rev. 5035: now there is an adding progress dialog. Closing it will stop the current adding process.