I've finally figured out that the long-standing crashing bug issue is caused by lines on a chart.
For example, if you draw a trend line and that trend line happens to be in the vicinity of the current price action then not only does it slow down the entire program until it is unworkable, it also causes the computer to crash.
This happened on Friday during Non-Farm Payroll on the Aussie chart when the price action was intense near a trend-line. It crashed my computer twice within 5 minutes. I took out the lines and everything was ok. The severe lag disappeared and my computer didn't crash after.
I left the horizontal lines on the chart as I don't think they cause this issue. Also, I've not tested this with any other chart elements. Only lines that can be drawn at any angle seem to cause this problem.