Nick,

no idea whether the motivation is performance or just plain convenience,
but is it conceivable one could write each Sheet with a dedicated
Thread to separate WorkBooks & then merge the finished Sheets
into a single WorkBook in a final step?

Would there be any advantage in that?

All the best,
DaveLaw

On 14/05/2017 17:15, Nick Burch wrote:
On Sat, 13 May 2017, yevsh wrote:
Is it safe to write to multiple sheets that belong to same workbook, from multiple threads?

No

It is safe for multiple threads to write to their own workbooks. However, all operations on a single workbook must be done from the same thread

Nick

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