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Scanner on historical data freezes


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The scanner freezes sometimes when runing scans on historical data. I run a historical scan using Yahoo market data and 'AutoBackfill'. There are 1840 symbols in the list and the scan freezes around 1400 symbols for hours. If I click in the scan result on one of the symbols  not analysed, it is scanned and increases the number of stocks scanned. But the scaning do not continue on the remaining stocks.

Any idea why we have so long freezes on historical scan with AutoBackFill on and what we could do to prevent so?


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