GWT Local Database?

I have a user application where a user loads a map with about
3000-5000 widgets on it. The user needs to be able to filter/sort/
modify these elements quickly. The server load is heavy, and GAE is
performing abominably.


My idea is to transfer all the elements to the client in a local
database such as the HTML5 local database. Have the user interact/
modify them directly in the client, send the database back to the
server, then update the dirty elements.


It's fine if my users are required to have HTML5, I'm not concerned
with this as its intended for a small set of users.

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