[everslick]

I'm not talking about deletes becoming "visible" on the timeline after a delay, I mean that the browser is completely blocked and unresponsive for 4-5 seconds (not minutes!). That makes deleting by hand lots of posts and likes a total PITA.

[firebones]

Could be, or could it be something that seethe user-agent and the influx of deletes from a tool as a denial of service and intentionally throttles responses?

Plausible deniability, right?