That goal is referring to latency spikes. GC is usually much less than 20% of the time on average, but it may take, say, 200ms in one go and then run for 2 seco

That goal is referring to latency spikes. GC is usually much less than 20% of the time on average, but it may take, say, 200ms in one go and then run for 2 seconds without another collection. It seems their goal is to ensure there's no large pauses like that, so the 200ms would be spread across the 2 seconds as smaller time slices instead.