This may be a stupid question so pardon my noobiness. I did a search and nothing came up about this.

I noticed that both themes on the N900 have a ton of files located in /usr/share/themes/ each taking up around 7 MB.

Is it necessary for them to be in the / partition or could they be moved to /opt/ ? Would this affect the performance of the themes?

custom themes run fine from /opt so i would think nokia ones would