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"Because low-level operation of SSDs differs significantly from hard drives, the typical way in which operating systems handle operations like deletes and formats resulted in unanticipated progressive performance degradation of write operations on SSDs. TRIM enables the SSD to handle garbage collection overhead, which would otherwise significantly slow down future write operations to the involved blocks, in advance."
Not only must the SSD support for the TRIM command, but the OS must be programmed to issue the command at appropriate intervals. Apparently, that support has finally been added to Android.