BeyondPod is the first and only RSS feed software that I've tried. I am afraid I can't offer any comparison. As for the concerns on speed, I ain't sure you were referring to the downloading speed or how fast the software renders a page. For the former, it is chiefly dependent of your mobile network and for the latter, I find BeyondPod to be acceptable. I've also not experience any problem listening to podcast and surfing net at the same time.
It could be that I do not have that many 3rd party software installed in the phone, I hardly encounter crashes or hang-ups and let alone from this software. In any case, the software doesn't cost a dime, give it a try and see if it fits. Cheers.
