Sorting and Filter slow performance when large dataset loaded ui-grid

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• This is a bug report, not a question on how to use the grid.
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• You have searched the open issues to see if this bug has been filed before. We don't want duplicate issues.
• You have reviewed the tutorials and documentation to ensure you are using the grid correctly. ui-grid.info
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• You have provided steps to recreate your bug. A plunkr is even better.