The plugins are native, not a web view in a panel. Suggestions render in the editor’s own inline decoration layer, so they arrive at the caret with no visible delay and never steal focus.
Project-wide context indexing runs in the background and stays incremental: the first index of a large repository takes a few minutes, every index after that follows your saves.
A refactor or a multi-line rewrite arrives as an inline diff you can read before you accept it, with the same keyboard shortcut in both editors.