Version: 66.0.3344.0
Reproduction Steps: 
1. Enable Chromevox Next.
2. sheets.google.com>>open a recent sheet
3. In the accessibility/settings menu, enable Braille support.
4. Attempt to navigate the sheet with the arrow keys.
Expected: Performance should be as good or better with Braille support enabled than without.
Actual: Performance is terrible. There is a general lack of responsiveness, and on the occasions when I can get Chromevox to read anything, it begins reading an entire row or column at a time. There is an immense amount of lag between a key being pressed and any sort of a response.

By the way, a while back, the recommendation from Googlers was that I use and report bugs with Google apps with Braille support enabled. Is this true? I was told that this should provide the best experience, but have not found this to be accurate.