if you are booted in leste and like an adventure you can try fstrim -v /dev/mmcblk1p1 (not sure it maybe /dev/mmcblk0p1)
to finally service "maemos vfat MyDocs" partition and maybe speed up your emmc writes.
It will even report how many spaces was marked free.
Be warned you may loose the opportunity to recover deleted files!
You could not do that from an old 2.6 kernel.