importing a file with 350 thousands cells takes a long time

Steps to Reproduce

1. import the attached file

Current Result

it takes 18s to import and render

Expected Result

takes a shorter time

Debug Information

• it takes much time on comparing cell styles:
  
• from kanalyzer

====================RESULT====================
cells : 350,661
sheets : 1
formulas : 3,775
cells-each-sheet, 1 : 350,661
text-cells : 4,942
refs : 3,775
formats : 14
images : 0
charts : 0
protected-sheets : 0
form-control : 0
conditional-formatting : 0
data-validation : 0
named-ranges : 289
====================RESULT====================