Sqlite on Dm500 Performance

[Fano]

Hi guys,
I am looking for some feedback on running a sqlite epg on a Dm500s.
I have the Radiotimes guide running on my 500s and the resultant database is stored on a mounted hard drive on my pc.
I can only store 1 days epg at a time (~2.5MB),any larger than 4MB and the box freezes up .
It works pretty well but the problem occurs if I watch foreign sats like 19E or 13E.
The database starts incorporating these listings into it and the resultant file size can be huge,well over 6MB.
The receiver just freezes up and I have to delete the .db file and start again.
I presume this is due to a lack of memory on the 500s but is this a standard issue ?
I have seen people running a 7 day epg on the DM600 and it does have extra memory (96MB vs 32MB ) so I guess it could work well on the 600 .
Does anyone run the Radiotimes or Rytec epg's and what kind of performance are you seeing as I think I might have to upgrade my receiver .
Many thanks
Fano