today I´ve tried some different codecs after I downloaded hdcinematics' DSLR Post Prep Utility and here are my findings among Cineform HD (which I normaly convert to), Avid DNxHD and just mts. I usually transcode to CF, because Premiere Pro has a hard time to decode avchd on the fly, when it´s getting serious (multiple streams...).

In Premiere Pro the response time to dragging the time indicator along the timeline was worlds better in both CFHD and DNxHD. Between the latter two I couldn´t really make out great differences here.

So I went into After Effects to check the same thing there. Here I got no mentionable timely difference in response time to my wild dragging of the current time indicator. Even the mts performed equally, compared to CFHD and Avid.

BUT: The adpative resolution came down to 1/4 on both CFHD and mts. On DNxHD it stayed on full and then eventually came down to 1/2 while maintaining a great response time. I didn´t expect that.

Tomorrow I will redo my rendering tests, my preliminary results just don´t make sense right now.