I won't hope that a phone would handle 10000 rows much better.
But that "Excel" thing might be an answer: the laptop must be running Windows, and Windows users often run an antivirus, and some Windows antivirus software is known to be terrible. (The MS-provided basic antivirus was always fine in this regard, though.)
But that "Excel" thing might be an answer: the laptop must be running Windows, and Windows users often run an antivirus, and some Windows antivirus software is known to be terrible. (The MS-provided basic antivirus was always fine in this regard, though.)