hmm :)
2:14 i felt there was too much going on pad-wise, i like the phaser work you did but i felt the entire song was a big phaser, at 3:8 it would have sounded ok if all of the sudden you didnt dop it, you kinda dripped the automation and made absence of the effect aparent. at 4:12 i like the delay build.i thought the bell shaker was a really nice accent throughout the song.
a little thick with the pads, but all in all not bad, probably one of your best songs.
advice: i have had to start doing this as well. rendering wave files at high quality of your work and entering it back in as samples and continuing from there, also it helps to go ahead and render or export parts of the song that arent always essential or instruments that only come in every now and then. that you from some lag.
you may need to reevaluate how well you are optimizing your effect and instrument set up to get all that you want out of the program before your computer starts pooping glass