That sucks. THeres a slight saving bug thats effecting a small number of users. Cloud Saves are coming soon to fix this problem. Ill message you when its ready and ill set you up with a boosted cloud save :)
All WebGL apps run significantly slower when not "seen". Minimizing or having the game in an unfocused tab in a browser will cause this issue. There is nothing I can do about the current state of WebGL. Best bet is to have the game in its own browser instance and don't minimize it. The browser instance can be mostly hidden by dragging it into a corner.
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Refresh shop will fix this :) still having a slight problem with multi purchasing