Would help to know what browser you use...But , just a few things , make sure your browser is set to accept cookies and all site data. DO NOT clear cookies and cache too frequently. Make sure your allowing at least 100 kb of space in flash strorage for WGT. And did I mention , DO NOT set your browser to delete cookies and cache everytime you close your browser. It wont help , it will hurt...you'll be compiling new game files everytime you return. There are other things you can do in game settings like turning your reflections off and lowering your flash quality. But you can read those as you go through settings.
GL , Ace