High CPU usage and only one core is used.

[gitsang]

When the generated text becomes longer, the CPU hits 100% on a single core, and then the entire nvim becomes very sluggish, with output also becoming very slow.

1. Is this an issue with Avante or with NeoVim?
2. Is this a normal phenomenon? Why does it require such high CPU performance?
3. If high CPU usage is indeed necessary, can multi-core processing be utilized?

Ref: #1341