Hi Marko,
We regret for the inconvenience caused.
Currently in Gantt we don’t have support to change the “enableVirtualization” property dynamically, for this we have logged a feature report as “Support for dynamically update the enableVirtualization property”.
It will be implemented and included in our upcoming Volume 1, 2018 main release and it will be available at end of January, 2018.
Please let us know, if you require any other assistance.
Thanks,
Suriyaprasanth R.