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First, ensure you're using an AVCHD project preset. Then render your file by pressing Enter so that the red lines above the clips on your timeline turn green.
If that doesn't work, it's possible your operating system will need to be tuned and optimized to work with these files.
I also find the tips in this ARTICLE useful for setting up a computer and for starting an NLE session.
Though AVCHD material is more CPU-dependent, than other formats, one's I/O sub-system, i.e. the internal HDD's, their speed, size, controller type and how they are allocated, can have an impact too - though more so with other formats.
Thanks Steve, I didn't no about rendering a preview.
So I guess that this create a small resolution version on each clip to work with?
When selecting presets for a new project, what does it matter if I choose full HD or someting else? How does it affect my work?
If I choose another setting does it mean I won't be able to save it as a full HD blue-ray DVD?
Rendering yields a full preview in the resolution of your Project. Often, it's not necessary, but then I am working with DV-AVI material in DV-AVI Projects, and only use Rendering, when I have done a lot of Keyframing, or added a lot of Effects, that I need to see clearly and smoothly.
As for the Project Preset, it should match your source footage 100%. If not, you can get Frame Size mismatches, and also FPS mismatches, where Rendering will not likely help the smoothness of play all that much.
If you need a different size for output, you can do that with your Export/Share settings.
Thanks for both of you.
You're most welcome!