Very poor scrolling performance in VS2019 16.11.27

[daiplusplus]

Since installing the extension I find that code-editor scrolling performance in VS2019 suffers badly when scrolling a T4 file with even a moderate amount of T4 code-blocks.

When dragging the scrollbar down it starts behaving erratically (e.g. the scrollbar thumb just jumps around, top to bottom) and the document view sometimes goes blank for a half-second.

I can make a screen recording and share the T4 files I'm working with if you like.