SampleMACrossOver Backtest slow if run after a Custom Strategy w/o first closing NT7

[ChiTrader2000]

Hello,

When I open NT7 and backtest the "SampleMACrossOver" system that comes with NT7 over a massive amount of 1 minute bar data , it backtests very quickly.

Then, when I backtest my own (very) complex strategy over the same data, which accesses SQL Server and a proprietary time series tick database millions of times, it runs slowly, as expected.

But the weird thing is that if I re-backtest the SampleMACrossOver strategy again after running my custom strategy, without first closing NT7 it is about as slow as my slow custom strategy.

When I close and reopen NT7 and re-backtest the "SampleMACross" system it is fast again.

Why would NT7 backtesting of the SampleMACrossOver strategy slow down so much when it is backtested after my complex custom strategy?

What can I do to fix this behavior?

Thanks in advance,

ChiTrader2000