xbmc/xbmc — comment on commit 8878dd3261da9902d0ada0ec14f8627d581159e4
File:  line 0
By davilla:

too slow on i5's running at 2.4GHz, none of my boxes can do it either. Note that this issue is SD vs HD, SD is fine, HD is the issue, 1080i mpeg2 specifically.

As far as I can tell and from talking with bob, we have no method to fall back to something that works and even HD is an issue for other platforms too. Basically you cannot use YADIF for HD content.