-q tag for /ew, /mp

Object, fix the server lag not the solution for it.

If the server is lagging due to multiple entities or mobs, then it should only take you one wipe to work it out, you can identify the perpetrator from there.

A better suggestion would be to log who places what entities. Then using an extra tag (maybe -i for example) would produce a client-side list of all mobs/entities and the user that spawned/placed them.

Yes. Yes. Yes. Vouch. Vouch. Vouch.

I'm all for anything to keep us stealthy at times.

↩  Shdwo Agreed with shdwo, but also vouch for the idea. Minecarts being the popular choice for entity lag they should be focused on imo.

I think I'd prefer to see it in chat so people know it's happening and that their stuff hasn't randomly been de-spawned.

Declined.