We’ve studied your project. The problem is that your history database FVE save period is too small - 1000 ms. It collects too many data in database. For 8 tags - 8 values in second, 480 values in minute, almost 30000 values in hour and almost 700000 in day. When you try to handle it by using charts it takes too much time (on my PC almost 30 seconds). At this period because your period is 1000ms history database put another scope of values into database, and because all your trends are auto refreshed they tried to update graphics and try to handle 700000 values again.
I recommend you to increase history database FVE save period at least to 10000ms. And uncheck “Auto refresh” for all trends (charts).
I think in the next version we’ll solve this problem for charts by handling such big data automatically, but at this moment use my recommendations.