It will only look choppy in preview - when rendered all will be well.
Some effects hit the processor harder than others and cause more slow down - radial blur, sharpening and esp motion blur are really processor intensive (just examples).
To get faster frame rates in preview reudce the size and quality of the preview window or get a really fast computer.
Anything less than a core duo or amd equiv can be clunky.
You can also pre render small chunks on the timeline to ram for quick testing at full frame rates (under tools), but you need 2 gig or more of rem for this to be of any use.
As a noob (no offence) buying a very expensive and complex editing program is brave to say the least - down load and read ALL of the manual is my advice.
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Lowering the tone of video since 2004. www.zaskarfilms.com You tube channel 'zaskarfilms'
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