HD Video Lag

[Wil Laughner]

I just dusted out my computer and didn’t see much difference with hd video. Help?

[Mike Kujbida]

[Wil Laughner] “I have a bad habit of editing directly from the SD card. But I don’t think that will fix the problem.”

That’s where you’re mistaken.
SD cards are storage medium only and were never designed to be the equal of a hard drive.
Copy the footage to your computer’s hard drive, ideally drive D with drive C being your programs and D being reserved exclusively for all your raw and edited footage and anything else project-related.

[Mike Kujbida]

[Wil Laughner] “I just dusted out my computer and didn’t see much difference with hd video. Help?”

You’ve been told by more than one person here that your computer isn’t up to the task of editing the footage that you’re using.
You need to realize that they’re trying to help you, not criticize you, so I recommend you start taking their advice.