Comments

musicvid10 wrote on 3/16/2013, 6:52 PM
"How many reasons can there be?"

Your source
Your project settings
Your system
Your fx, pan/crop, motion, envelopes
Your Vegas version, Quicktime version, OS

But you haven't told us any of these.
set wrote on 3/16/2013, 6:57 PM
and what quality do you use on preview window.

Best-Full need more time to process while preview-draft is faster.

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NickHope wrote on 3/17/2013, 1:17 AM
This list was started by John Meyer and I've added to it.

7 Guidelines for Fast Preview Speed

1. Match project properties exactly to your source footage. Use the "match" feature to do this. Failure to have these settings correct is the biggest reason for slow timeline playback.

2. Don't use higher preview resolution than necessary. Use Auto instead of Full, and use "preview" or "good" instead of "best," especially when smooth timeline performance is more important than being able to see every last detail.

3. Turn off "scale video to fit preview window." This doesn't make a huge difference, but it helps.

4. Make your preview window smaller.

5. Set "Deinterlace Method" in "Project Properties" to "Interpolate" instead of "Blend".

6. Try setting "Thumbnails to show in video events" in "Video" preferences to "None", especially for multicam projects.

7. Set video events to "disable resample". Use right click > switches, or use one of these scripts.