Has anyone else wondered why......

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712mb memory 4.3% CPU usage 32bit Client- P99 Teal Server

337mb memory 0.6% CPU usage 32bit Client- WOTLK Private Server

These are the only 2 games that I play on my laptop, and im really not understanding why a game that released in 1999 is using way more resources than a game that was released in 2004+ (considering the expansion pack). Whats up with the patches that we have to install everytime someone installs eq to play on P99 (were on V52 now right?)
The only thing that I can think of would be using the resources for data mining? Someone please enlighten me. And has anyone else noticed this? [You must be logged in to view images. Log in or Register.][You must be logged in to view images. Log in or Register.]
Sorry if this should have been posted in technical.