I have tested this Oscam issue in some detail and have found
1) This freezing/ long ecm times with (certain 19e caids!) is not present in other images for my Solo2/Edision Mega (both Mips) with identical configs from my 5.4.9 config.
2) I have not installed any Oscam ipks and have have always started from a fresh image with no restores. Foreign testing Oscams are alwys ftped to /usr/softcam.
3) Many Oscams that previously worked with versions of Vix pre 5.4.7 and before, no longer work and produce issues
4) The supplied Oscam (oscam-latest) freezes with Vix 5.4.9 also
5) Making changes to oscam.conf and oscam.server or adding oscam.dvbapi makes little difference with me.
Conclusion:
There seems to be an (undefined) VIX problem with Oscam post versions 5.4.7 that is NOT present in OpenATV, OpenSPA, Pure2, Opendroid images for my 2 MIPS boxes (I use openboot to boot these from USB)