Using a flash drive for data storage - questions

I take video clips whenever I travel and when creating DVD videos, want to intermix the clips with still images. Over a long trip, so many videl clips are created that it is required to download these to free up space in the camcorder. For me, a flash drive (or pen drive) is an ideal medium. However, I have found that even with a "fast" drive having a spec of 20MB/sec read and 18MB/sec write, the data transfer slows significantly when the transfer is of either video (.AVI) or music (.mp3).
For example, I have a Sony flash drive with the above specs. Transferring straight data files such as word or spreadsheet documents, I measure the speed at approximately 12MB/sec. But, when I transfer video or audio, this drops to about 4MB/sec.
When I look up transfer rates on the net, it gives one figure specifying this as "data transfer". I could find nothing to indicate the change, if any, in this rate if video or audio files are transferred.
Does anyone have experience with this? Basically, I am trying to find the fastest 2 GB minimum flash drive at a reasonable price, but will I lose all of the speed as a function of the type of file.
Thanks

Yes, if these are normal data files and the flash drive is formatted for Mac OS Extended (Journaled) or FAT32.

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