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We currently deliver all registered themes to the client which takes up 142k javascript code. In the case for the Examples demo, we only need the business theme which has only 44k. I think this is worth to investigate when looking at client-side performance.
Also on the topic of optimizing ThemeStore performance: Its worth looking into the "resolve" funtions called when the theme-values are define on the client. Afair they need a considerable amount of time at startup. Perhaps some of the stuff they are doing could be done on the server, or can be done on-demand by the ThemeStore.
Themes are now registered as static JavaScript resources. Later on, we could even consider to let them contain only JSON. Only the default and the current themes are included in the startup page now. The default theme is still needed as a fallback, but this may change (see bug 363736).