[orca-list] a page that slows down orca master

[José Vilmar Estácio de Souza <vilmar informal com br>]

Hi all.

To reproduce try the following steps using orca from master.

1. Using firefox access the following url:

https://engineering.shopify.com/blogs/engineering/building-data-table-component-react

2. After the page is loaded press ctrl+home.

3. Press the h key until orca announces:

Start With a Basic React Data Table

4. Try to navigate in the page using down arrow.

In my environment orca takes some delay to announce the lines.

This doesn't happen using orca 3.32.0.