Sorry but I do think that there is a problem at your end either with your connection or the PC/laptop that you are using. Another speculation could be that you are selecting full version instead of lite version
If you actually open up task manager, you could view the difference between the full version and the lite version in eating up your memory, the lite version is working smoothly and no more user has encountered issues of the site being laggy
Anyhow if OP is asking for dice sites, then DaDice is the sites to use with the level up faucet system which user will like it. The lite version is working smoothly and no user has been encountering issues anymore. Site is also reaching 50,000,000th roll soon