How bad is this games engine?

How come CSS has better graphics than crossfire and gives better frames than crossfire with MUCH less lag. I don't know much about how video games work, but what is it that makes this games lag SO terrible. CSS has no interp, provides beautiful frames on an average computer, and has such smoother gameplay in terms of model and weapon movement.

I would like some explanations as to WHAT it is that makes this games engine so horrible in terms of frames per second and the interp.

For example, i strafe peak see an enemy, then strafe back behind a wall. 1 second later i get shot with that enemies bullet WHILST im behind that cover wall. Also i get higher fps in a 15v15 aim map on source than a 2v2 on crossfire.
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