From widgets to QML. Some problems

Hi All!
I need help. We have some application(With Qt widgets). It is model with data (more than 70000 items) and table (QTableView). Also we can filter items (with QSortFilterProxyModel using) and search with founded searchword highlighting (use QSyntaxHighlighter).
But now we want use QML in our application. There are two problems:
1. Filtering with adding groups to DelegateModel has bad performance. Can we use some another solution for QML filtering? (we can use C++ QSortFilterProxyModel but we want know about all variants)
2. Has QML solution for founded searchwords highlighting and moving from one to another founded items?

You want to use QSortFilterProxyModel if that already works for you.

Cheers,
_