I'm interested in seeing us make the Civi to IBM export leaner. It currently exports over 18 million rows of data every night. Every Big English, the export job ends up failing a few times, I think partly because the file is just so big. It also takes a long time to run the import on the IBM side, during which time no other data jobs can run (like sending a mailing).
The solution: in the nightly export from Civi, only export rows with values that have been updated in the last 48 hours. That will bring the row count down from over 18 million to what must be less than a few hundred thousand.
Additionally, this will address a problem we have: we can't perform normal data hygiene and purge undeliverable addresses from IBM, because the Civi job re-adds them to IBM each day. This prevents us from getting accurate list counts which impairs our projections.