It's ok now, I moved some system apps to /data.
But I have another problem. After about 30 minutes the system says 'sd card was removed', so the 2nd partition is gone and all apps linked to that partition stops working. Then I have to restart.
I tried 3 different SD cards with the same result
I had no such problem with other roms
Maybe Link2SD is incompatible with this rom?
I don't know what to do.
I have been using Link2SD very long time without problems, but it seems, it is somehow incompatible with this rom.
I've tried Apps2SD and it works fine!
Unfortunatelly the problem is the same
Apps2SD hasn't saved me.
I connected the SD card to the computer and have checked and fixed all problems - there were some....maybe that was why the SD card was being disconnected to often.
Then I disabled or set back to default all settings in Performance.
And now it seems it works.
Maybe it would have worked with Link2SD as well, but enough of experiments... I spent too much time with it
So as I said in the beginning... this ROM is absolutely great, thank you for this.
It's amazing how this... such an old phone... could serve even today.