What version of Tableau are you using ?
What you do mean when you say "toggling between extracts" ?
15Mb is TINY really, so there must be something in your local environment that is having an impact.
I am on v10.3 (32-bit)
And I agree, I was shocked as I've seen much larger .tde files used w no issues at all. Not sure... I am going to upgrade to the 64-bit today and see if that helps things...
Lastly, be Toggling between sources I was referring to "Replace Data Source" when linked to multiple Extracts.
Thank you for the response. any suggestions or insight would be appreciated.