Data explorer performance degradation post introduction of smooth scrolling

[testlabauto]

System details:

Positron and OS details:

Main in CI, ongoing

Interpreter details:

N/A

Describe the issue:

Since smooth scrolling was introduced, we have had to bump the timers which time from:
click of a variable row for a data frame
to
stop of dataframe loading spinner

by 700%

Steps to reproduce the issue:

This reproduces in CI with the Very Large Data Frame Test. It opens a 20x1million data frame.

Expected or desired behavior:

Ideally the introduction of smooth scrolling would have had a negligible effect on load performance

Were there any error messages in the UI, Output panel, or Developer Tools console?

No