Extreme lag from pressing Tab to action when extension is running in remote (ssh) host

[picrots]

Due to network speed or load on the remote host machine sometimes I experience huge delays from when I press the Tab key until I see the cursor move. It can get up to 10 sec sometimes and there is noting more annoying than typing unresponsiveness.

I guess my question is that does the extension have to run on the remote site or it is possible achieve the same result running locally for code that exist on remote site but edited locally?