Reduce pauses on large device list changes #1215

Job	Run time
check-lockfile	6s
changes	2s
lint-crlf	5s
lint-newsfile	35s
check-schema-delta	40s
lint	47s
check-sampleconfig	36s
Typechecking	1m 41s
lint-pydantic	53s
lint-clippy	0s
lint-clippy-nightly	0s
lint-rustfmt	0s
linting-done	1s
calculate-test-jobs	6s
trial-olddeps	7m 3s
portdb (3.8, 11)	2m 51s
complement (monolith, SQLite)	13m 22s
portdb (3.11, 15)	2m 57s
complement (monolith, Postgres)	13m 11s
cargo-bench	0s
complement (workers, Postgres)	20m 24s
cargo-test	0s
trial-pypy	0s
sytest (focal)	8m 31s
trial (3.8, sqlite, all)	4m 29s
sytest (focal, postgres)	10m 24s
trial (3.8, postgres, 11, all)	10m 27s
sytest (focal, multi-postgres, workers)	13m 43s
trial (3.8, sqlite)	3m 50s
sytest (focal, multi-postgres, workers, asyncio)	19m 48s
export-data	2m 5s
tests-done	2s
	2h 18m 39s

Provide feedback