BetMoose has significantly more features and visual bulk than a stripped down basic site like bitbet. So yes, it will be more intensive on your CPU and require more bandwidth (and time) to load. The 2 websites are not comparable in terms of page-load response based on their design.

We are not aware of any big/fundamental changes that can be made to improve the performance of the site, outside of getting faster servers. As BetMoose is run by volunteers, 100% of our fees already go toward hosting and operational costs. If you'd like to make a donation, we will get faster servers just for you.