Warning messages in supervisor_logs

I see several warning messages in C:\Users\myname\AppData\Roaming\Pi Network\docker_volumes\supervisor_logs, such as

[Perf WARNING] Dropped 8 slow-execution warning messages
[Herder WARNING] Ledger took 20.2577214 seconds, SCP information:{"node":"GC6OH","qset":{"agree":2,"cost":{"7533492":{"testnet1":13516,"testnet3":6680}},"delayed":null,"disagree":null,"fail_at":1,"fail_with":["testnet3"],"hash":"c51e25","lag_ms":{"testnet1":211,"testnet2":220,"testnet3":112},"ledger":7533492,"missing":["testnet2"],"phase":"EXTERNALIZE","value":{"t":2,"v":["testnet3","testnet1","testnet2"]}},"transitive":{"critical":null,"intersection":true,"last_check_ledger":7507561,"node_count":4}}
[Process WARNING] process 6841 exited 22: curl -sf https://history.testnet.minepi.com/history/00/72/df/history-0072dfbf.json -o buckets/tmp/history-9377b2df44852b04/stellar-history.json

What can I do to avoid those warning messages?

pi-node / instructions