Better MicroSD performance?

[LodeRunner]

MicroSD cards are getting absurdly cheap and going forward I believe they're only going to get cheaper. There's a sale at Office Depot right now, $20 for a 64GB class 10 microSD card, and I want very badly to pick one up but I have no use for it, as my current MP3 Rockbox players (Clip Zip, Clip+, Fuze, and I think an e260 floating around here somewhere) can't even handle a 16gb card. The slowdown is abysmal and the shortened battery life (even when playing from internal memory it seems) is unacceptable. I greatly appreciate the efforts of everyone who has contributed to Rockbox, but if it can't handle large storage on lower-powered devices then I fear it is, for my needs at least, sliding towards obsolescence.

Are there any plans to fix this in the foreseeable future?

[saratoga]

Fix for what? Rockbox already works with arbitrarily large cards.

Edit:  Regarding battery life:

http://www.rockbox.org/wiki/SansaRuntime

Clip+, 4GB    16h 30min    No SD card, sd variant 0 by saratoga
Clip+, 4GB    16h 15min    8GB SD card, album on internal storage, sd variant 0 by saratoga

So as you can see we do effectively power down the SD storage when not in use. 

[LodeRunner]

Possibly I might have been mistaken about battery life (I've never timed it, just subjective impression) but it definitely takes a hell of a lot longer to boot up, for instance. Every time, not just immediately after new files have been copied over. This is more of a problem than you might think, as my primary use is while I'm at work and interruptions are inevitable.

[saratoga]

definite takes a hell of a lot longer to power on, for instance. Every time, not just immediately after new files have been copied over.

Start up should take a few seconds no matter what storage is attached.  If you have some problem, it might be a good idea to explain what it is. 

[chrisjj]

definite takes a hell of a lot longer to power on, for instance. Every time, not just immediately after new files have been copied over.

For what it is worth, that doesn't happen here. E.g. the start-up time is IFAICS the same with and without a 32Gb SD card having 1,254 files, 6.6Gb. That's using the latest ZEN build.

[Strife89]

IIRC, three of those devices (Clip+, Clip Zip, Fuze) are low-RAM targets. Trying to load a large dircache and/or song database will almost always lead to slowdown if they have to be loaded frequently, in small chunks.

[toehser]

I wonder if there is room somewhere for R/AM usage optimization of those structures, or a minimal-info mode that skipped some fields, or something.   I find 64GB cards quite usable on my Clip Zip - but, I don't use the database, and I probably tune the dircache, and I'm tolerant of slowness when I load 10,000 song playlists...  Do we compress the structure in memory or anything already?