Setting Value Efficiency

[coolboy0002001]

When setting value repeatedly with many cols, it runs very slow!

col := "A"
for i := 0; ; i++ {
	col += "A"
	xlsx.SetCellStr("Sheet1", col+"1", "a")
	fmt.Println("set value")
}

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[xuri]

@coolboy0002001 Thanks for your issue. I've done some optimization on this issue. The benchmark report of the current version of this library is shown on the wiki page. I will continue to focus on performance issues and optimize it. In addition, as a performance-related problem, I close this and merge it into the issue #29 is still discussing this problem.