make gadget filtering 10x faster #345

Job	Run time
ci / Build	3m 18s
ci / Typecheck	1m 5s
ci / Test (0)	1m 59s
ci / Lint	2m 6s
ci / Test (1)	6m 33s
ci / Test (2)	1m 43s
ci / Test (3)	1m 21s
ci / Test (4)	1m 47s
ci / Test (5)	3m 9s
ci / Test (6)	3m 4s
ci / Test (7)	2m 24s
ci / Test (8)	2m 9s
ci / Test (9)	2m 51s
ci / Publish Unit Tests Results	1s
	33m 30s

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