Swapping not like real ram, like i said virtual ram. But All of you be can sure, virtual ram really boost the (our) phones x10 times.
Example: closed ext swap last night (from clock work mode) and installed "ram manager pro." And added 1gb (1024mb) (also will add 2048mb) swap ram to my fit. I did because of clcokworkmode give only 256mb swap ram.
Result: All apk's first open really open like vanilla (default). But after second one, you can see improvement. Speed comes with smile. And best thing for you, ram optimitizion scripts and task killers not necessary. Because swap file directly answer your response with 30mb/ps(+) read rate.
Recommend: Try with 8gb class 10 sd cards, they're cheap nowadays, you won't regret
Tip: Galaxy fit support only (maximum) 32gb sd cards.