Whose review are you quoting there? It would be helpful to say.
Also, just because I'm unwell and sat in bed with my DX220 next to me, I took a short video out of curiosity.
Will try to upload it here, not sure how..
[EDIT: tried to upload video from my hard disk, but can't do it! Anyone know how?]
I am finding pretty much no lag whatsoever.
Occasionally I get a 1 second lag, like when loading up the whole list of folders on the micro-SD card (that didn't happen here, as you can see).
But - for myself at least - I couldn't care less. What's 1 second? I just get to enjoy my music on a terrific sounding device a second later
I cannot say whether you are right or wrong with your own experience; I can only say that your description of it as "slow and laggy" is completely alien to my own experience.