Zoho Sheets -- copy and paste of a single cell causes entire sheet display to refresh when doing the paste

Zoho Sheets -- copy and paste of a single cell causes entire sheet display to refresh when doing the paste

I am working with s 13,000 row spreadsheet. When I right-click on a cell and select Copy and then right-click on
an empty cell and click Paste, the entire spreadsheet disappears for a second or two and then reappears with
the formerly empty cell filled in. The refresh of the display is unexpected and surprising. Is this a bug? Is there
something I could do to stop this from happening?

Thanks.