I wouldn't call something that is 5-12 frames slow at all......
Considering the fact that prior to DoA4 almost all throws were in the 4-7 frame range and low throws were in the 2-4 frame range...Yes, current throws are slow. Izuna drop is what, 12 frames now? It was 7 in 3.1. Bass' super launcher was 5 frames, Bayman I believe had a 2 frame low throw, Hitomi's 33f+p was 7 frames compared to now where it is 12 frames, and her low throws were 3 frames compared to 5 now. It was rare for a throw to be more than 7 frames and throw punishment was much easier in older DoA games. The only other throws that were usually over 6-7 frames in DoA3 were typically catch throws like Jann's DG was 19 frames, or Ryu's little jump and and grab your head throw (don't know the input) was like 22-25 frames.
With the exception of the standard throws, the average throw in DoA5 is 7-12 frames with most of the "good" throws sitting at 10-12 frames. So yes, compared to what we used to have, I would call throws slow atm, especially 12 frame throws. Not sure what makes you think that is fast, but that is a ridiculously slow throw.