Is your whole page loading slowly or just the chart? If it's the page, then the problem is in your PHP, not the chart. If you remove the data pulling code from this page and build a separate query script with it, then you can use AJAX to fetch a JSON string from the query script and populate your chart(s) with that. Your page will load faster and you can put loading spinners in place of your charts (jQuery's AJAX functions can handle this kind of stuff for you, and you won't have to worry about building a Google-compatible query source).
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