Well below is the translation from google posted at samsung-firmwares
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From what I've read so far, i570EXXJD1 is the Russion ROM and has no improvement over JCE (If you're not Russian that is
).
Hotsnow's post on 4PDA.ru forum (translated with google translate):
First impressions of XXJD1:
1) The speed of the Pantheon, the standard (not an ounce has added to the velocity, compared with JCE)
2) 130 mb free memory (no progress, everything is standard, as in the latest firmware)
3) By the way, despite the CSC with our as I understand "locale", the Russian did not appear by default)), all the handles ..
4) the Internet as "the Russian default, does not appear .. (Although all easily settled "handles")
5) gallery, music, etc. The standard applications work as well as in the JCE (subjectively, not found until the changes)
6) Video player, I thought, was a little "frolic")) (in terms of peremotok, and in terms of "Do not run ahead" sound))) Although to be honest, at this point, most likely, it's more my desire)), than real differences ... (From the same JCE)
7)Tested a few games (pulserider, Doodle Jump, well, so for pennies), which in general is going to Speke without problems)) (even on JCE, in all these games are not artful regularly occur are small, quick-passing, but slowdown .. even if you choose to bare firmware) So at XXJD1 - In principle, ideally go!
I certainly do not make the final predictions (all 3 games tested), and probably all that really hindered (3D games), and will continue to slow, but interesting!))
Or am I missing something?
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Anyways, I've just flashed to this and looking for what's different...