using https://jpmorganchase.github.io/perspective/examples/superstore.html in IE 11,

scenario:

1. switch to grid mode
2. unselect country and city
3. move country to columns, after sub-category

results:

1. it's veeery slow - is it because of perspective or because of hypergrid?
2. console shows:
   SCRIPT5022: Assertion failed
   webcomponents.min.js (11,1555)
   View cancelled
   View cancelled
   Setting up initial schema and data load into HyperGrid

that's probably indicating an internal fault?