Load the variable into memory after a page refresh. When the user connects their storage, data will come in and will be loaded automatically. Also, data that was stored into the SyncedVar since the last page refresh will stay loaded automatically. The only situation where the memory is flushed and you need to call SyncedVar.load, is when the user refreshes the page, or closes and reopens the tab, closes and reopens the browser, or turns the device off and on again.
A promise that fulfills when the value has been loaded from IndexedDB, through the BaseClient, into the SyncedVar (and therefore into memory).