Could you please clarify the problem? Is it just that you can't scrub through the composition in real time when you're using this kind of footage, or is something wrong with the images, previews, or final rendered output?
Thank you for your quick response.
The composition has only one layer ( of .mts 1920x1080 24p, 210MB, 1 minute long) and no effect. Just pure raw footage.
It's when scrubbing through the footage in realtime that the CTI feels really heavy as if you're dealing with a very heavy composition with lots of effects.
Even if use the "quarter" resolution/downsample factor button it still feels heavy.
When I render this same footage in to a tga sequence (no rle compression=10.9GB) I can see a huge difference.
Although the sequence takes so much space scrubbing through is very fast and responsive even with "full" resolution button on.
I have tried all the options of "Fast Preview" but the is no difference.
If you need any more info please let me know!
After Effects isn't a real-time program, like an NLE.You shouldn't expect scrubbing to be smooth in After Effects; it's just not what After Effects does. It's not what any compositing and visual effects program does.
AVCHD is a long-GOP format (i.e., to decode each frame,After Effects has to get information from multiple surrounding frames). Playing these back therefore takes more time than is the case for formats that contain all of the information for a frame within that one frame.
After Effects CS5 has made a lot of performance improvements, but they mostly affect RAM previews and rendering to final output, which are the two features that can take advantage of Render Multiple Frames Simultaneously mutliprocessing.
There are a lot of tips for getting After Effects to work faster for various purposes here: "Improve performance"