Workbook .ToDocument()/.Save() stuck processing

Hello,

Saving to excel is not working depending on the amount of data. Columns with formulas are the cause.
Less amount of data can be converted to excel.

Sample JSON here: https://drive.google.com/file/d/0B-ORCNWgXhVoYWVvQUYybjhRWVE/view?usp=sharing

Telerik.Web.Spreadsheet.dll 2016.1.301.45