Maybe a large error structure? I had been dissatisfied with cider error popup latency so I turned it off a long time ago. I now only bring it up if I need to see more details

it's pretty slow no matter what

you're right though, not often that i actually read its contents. will disable

I've been seeing the same issue. Unfortunately I am not sure when it started. Using a very recent build from master and 0.26.0 middleware also

If someone manages to get some profiling data about the issue that’d be great. Usually such delays are caused by errors/timeouts.

I can’t think of any recent changes that would cause some regressions there, though.

See https://docs.cider.mx/cider/1.1/troubleshooting.html#profiling-cider-commands