termcat seems to mangle speed

[Moult]

I'm trying this:

$ termcat *.ttyrec.gz outfile
$ termplay outfile

It seems as though the concatenation works, but the speed becomes super fast and uncontrollable. Note that doing term play on the individual files seems to work without issues.

Did i mess something up?

Note:

$ termtime foo.ttyrec
3905.850857  foo.ttyrec
$ termtime outfile
0.005540  out.a