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1f89b7f7b9
With these changes, we can backfill about 400-500 slots/sec, which means a full backfill of mainnet takes about 2-3h. However, the CPU is not saturated - neither in server nor in client meaning that somewhere, there's an artificial inefficiency in the communication - 16 parallel downloads *should* saturate the CPU. One plasible cause would be "too many async event loop iterations" per block request, which would introduce multiple "sleep-like" delays along the way. I can push the speed up to 800 slots/sec by increasing parallel downloads even further, but going after the root cause of the slowness would be better. * avoid some unnecessary block copies * double parallel requests