Am I correct in assuming that the reason the trezor is so derpy these days when it used to be fast as lighting is the result of patching some power analysis attack vectors?
Are you talking about the mitigation as described in this article
http://johoe.mooo.com/trezor-power-analysis/ ?
On the bright side, this simple side channel attack can be mitigated by using constant-time code and as I showed this code does not have to be slow
Hm, I bought my trezor just a few months ago, ... I think it's responsive enough, but I have no reference.
how much faster were earlier models exactly?