nemo

I assume you have this change worked up locally? I won't work up a PR. LMK otherwise.

Yes, I think so, too. Those could only be set when there is a `@` mention query found, not just every change. We only need them to be accurate in that case.

I suspect if might be enough to not `setUserDropdownStyle` and `setMentionIndices` on every change. These object literals each have a new reference and trigger a rerender even if the object is functionally identical.

k00b

I'm not sure I've pinpointed the exact issue, but making more use of `useCallback` and `useMemo` in the `MarkdownInput` and `UserSuggest` components seems to be helping locally. At least, I see fewer longer commits in the profiler