Video lags when effect plays. Please help.

When ever I try to play back a short 10 second video of just a twirling lightsaber effect(using copilots preset)it lags the whole way through the effect, but nothing else.
It does the exact same thing even when I use(I think) the highest settings.
Anyone have any ideas on what I am doing wrong?
I am thinking that it doesn't involve rendering, but involves something with the making of the file. Like I may not be finished with it I guess?
I'm new to AE.

No, I have skip frame on zero.
And sorry, I just don't know much about this stuff yet.
Ok, this is the problem.
When I preview a film(also by clicking the preview with ram under the composition tab) the film skips and is slow. Like skipping many frames, even though I have skip frame on zero.
If I render it with the highest quality the finished product will come out the same way as the preview.
Earlier I was trying to fix the problem and messed around with the project settings and the video worked fine, but now I cant remember wat I did and it is doing the same thing.

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