It takes about 2 hours to detect the Excel file which contains some pictures.

[ivanliu-microsoft]

Our CSV parser leverages PROSE to check if the string content is CSV format or not. But our customer reported that it took so much time (2+ hours) to parse before it returned false (Not a qualified CSV file). I find it is blocked by the line of codes below: (See the full codes) Here is the sample excel file attached. Quotation-Personal care wipes.xlsx My question is:

• Why this excel file takes so much long time to "learn" by the PROSE
• Any best practice recommended from your side in this case?