OK, so this not the average Joe instrument but still....

Making the instrument 4 times slower with a firmware upgrade

What will come next? Forced f/w upgrades??

Changes in performance due to export regulations
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Changes in US Department of Commerce export regulations require Tektronix to change a specification related to the
real-time performance of our instruments. Your instrument remains legal for you to own at its current performance, and
Tektronix can service and calibrate your instrument without making any changes to your current performance.*
However, if you’d like to update software of the instrument to gain access to new features, or to purchase new analysis
capabilities on the instrument in the future, it is necessary to update your instrument to our latest software. This
new software will affect the specification of minimum signal duration required for 100% probability of discovery and
trigger on brief signals. If you decide to install the new software, you can order a no-cost, customer installable
option (Option 09) that will recover the original performance. The price of this option is $0, but it does require that
we determine your eligibility to receive this performance based on the new export regulations.
*Some service functions that involve hardware replacement may require a SW upgrade to version 3.1.0029 or greater.
A summary of changes for each model is given for instruments with Option 110 (110 MHz Acquisition Bandwidth). To see
the complete specifications of all option configurations of the new software, please see the latest data sheet available
at Tektronix.com. To see comparisons and more complete explanations of the new performance, please contact your Tektronix
representative.
Performance SW 3.1.0029 Current performance (or Opt. 09)
- RSA6100B, all models 17.3 us 3.7 us