perf: optimize rendering time to resolve flickering issues during interaction with large data

[Emiyaaaaa]

• <- Keep this line and put an x between the brackts.

Description

When the duration between console.clear() and console.log(something) is more than a certain time, it will cause the screen flicker.

So I do the following changes:

1. Minimize the code between console.clear() and console.log(new display data) as much as possible
2. For some code that has to run between console.clear() and console.log(new display data), optimize their performance

Before Change（40~60ms render time for 2000 package lines）:

2026-03-03.11.12.47.mov

After Change（<5ms render time for 2000 package lines）:

2026-03-03.11.11.06.mov

Linked Issues

fixes #107

Additional context

Should keep the flicker-demo in the project？