Comment by marginalia_nu

Yeah it's usually a problem with asynchronous UIs. You basically need to simulate a synchronous UI to make the interface seem reliable.

The file copy dialog in modern windows versions also has (had) this weird disconnect between the progress it's reporting and what it's actually doing. Seems very clear one thread is copying and one is updating the UI, and the communication between the two seems oddly delayed and inaccurate.

The progress reporting is very bizarre and sometimes the copying doesn't seem to start immediately. It feels markedly flakey.