Answer by Simon_Weaver for Data size difference in SSIS output and SSMS output

Here's an even more surprising difference in bytes between my old and new laptop, when running a simple perf test from an Azure SQL database:

 SELECT TOP 10000 * FROM [Order] ORDER BY OrderId DESC

Old laptop: 348,057,200 bytes
New laptop: 523,447,600 bytes

That's 50% more data being transmitted for the same exact data.

• Both Windows 11
• Same database, (yes I'm 100% sure of this)
• New laptop SSMS 20, Old laptop SSMS 18.12

Whatever the exact reason will have to remain a mystery for now. Very odd though.