I have 2 issues:
With Qgis2web I can't export a heavy vector layer either as .shp or WMS.
I also can't make it display, the list of different values of the same attribute in the pop-up menu.
When trying to make Qgis2web not handle the dataset (25.000 polygons) with complex symbology resultning in that NO layers were shown.
Using a simple symbology however it worked.
(Reducing from 14 graduated classes to 1)