Thanks, Jeff, for the confirmation. Based on my discussion with the
developers, it's very likely that the low performance is due to some
function use in the spreadsheet. We have not figured out the exact reason
without a reproduce. Is it possible for you to send the spreadsheet to me
if your company's policy allows? You may remove the critical/sensitive data
from the spreadsheet, and send it to my mailbox

Thanks,
Jialiang Ge , remove 'online.')
Microsoft Online Community Support

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