I’ve never noticed any perceptible latency using iedit[1] in Emacs, which does what it sounds to me like you are describing. It does suggest a possible multiga

I’ve never noticed any perceptible latency using iedit[1] in Emacs, which does what it sounds to me like you are describing. It does suggest a possible multigap buffer structure though for efficiently doing simultaneous edits of distant locations in very large files. In that case though I’d probably be iediting a small wgrep[2] buffer anyhow so it might not really matter. [1] https://github.com/victorhge/iedit https://github.com/victorhge/iedit [2] https://github.com/mhayashi1120/Emacs-wgrep https://github.com/mhayashi1120/Emacs-wgrep