We've noticed that writing large files to disk is very slow on device; we've seen 1MB files take 8-12 seconds to write. The iPhone isn't a powerhouse of a device, but doing the same things with a native app written on obj-c seems MUCH faster.
Anyone else notice the same thing? Does Titanium's filesystem implementation add a ton of latency wrt filesystem operations?
I am having a very similar issue with this. Did you find any solutions to it?