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 The CPU usage isn't even half of the max most of the time. What I notice is the network traffic is idling and then there are bursts for some minutes and then goes back. That's why I'm wondering if there times when it is better to sync with more node bandwidth available? 
 No, there are no such thing as better time to sync.

May I know what monerod arguments did you use? 
 Pruned block chain and 1024 for peers out. 
 Try this:

```
p2p-use-ipv6=true
prune-blockchain=1
sync-pruned-blocks=1
in-peers=1024
out-peers=1024
```

Depending on how you are running the monerod, you will need to raise LimitNOFILE / ulimit -n, the safe value for the config snippet above is 4096 
 Trying this now to see what happens. Didn't know about sync-pruned-blocks. 
 I can't tell if it had any improvements. Still have some part of the day with higher sync rate and others where it goes quieter. 
 if CPU usage isn't maxed out it's blocked on disk i/o likely, storing the data direcotry on a faster disk (if it's not already a NVME) might help

(monero doesn't have the separation between an UTXO set database and the blockchain storage, so the entire thing needs to be on fast disk) 
 Thanks nostr:nprofile1qy2hwumn8ghj7un9d3shjtnyv9kh2uewd9hj7qgwwaehxw309ahx7uewd3hkctcpz9mhxue69uhkummnw3ezuamfdejj7qg5waehxw309ahx7um5wgh8svrx9ehhyee0qydhwumn8ghj7argv4nx7un9wd6zumn0wd68yvfwvdhk6tcqyq9288j6a7v6qq98hkctfxg43jftcj4zp7m9jvd995z4kh4kmlmnsnjgmms . The Disk is also not maxed out. I get a spike every once in a while, but than it sits at at low levels for long periods.

This is why I'm guessing that the network is drip feeding my node most of the time.