It's good to remember that you don't have to sync a Program to SFDC Campaign. It helps a lot with various reporting and having another way to view what leads have joined various pr...
See herehttp://www.marketingrockstarguides.com/sell-faster-with-marketo-sales-insight/http://www.slideshare.net/jdavidhill/sell-faster-with-marketo-sales-insight
I'm not 100% sure, but the more constraints on the range of activities will likely speed up any database pull. Of course, if you make that smart list complex, then it takes longe...
I wouldn't just buy a list and import it. What I'd do is rent a list properly, email or mail the list (or via the list owner) and drive them back to the site for an offer. Or i cou...
Possible solutions
Deleting a lead in Marketo deletes the lead. It is gone. Marketo forgets it.
Marketo only ignores unsubscribed=true and Anonymous. I recall someone saying th...