slowness for playground topic produce raw data about kafka-docker-playground

[vdesabou]

playground topic produce -t functions-messages --nb-messages 1000000  << 'EOF'                  
{"hello": "cava%g"}
EOF                                                                     
17:28:16 ℹ️ 📢 value no known schema could be identified, payload will be sent as raw data
17:28:16 ℹ️ ✨ generating value data...
17:28:16 ℹ️ 💫 payload is single json, it will be sent as one record
17:28:18 ℹ️ ✨ 300000 records were generated (only showing first 10), took: 0min 2sec
{"hello":"cava1"}
{"hello":"cava2"}
{"hello":"cava3"}
{"hello":"cava4"}
{"hello":"cava5"}
{"hello":"cava6"}
{"hello":"cava7"}
{"hello":"cava8"}
{"hello":"cava9"}
{"hello":"cava10"}
17:28:23 ℹ️ 💯 Get number of records in topic functions-messages
2000000
17:28:23 ℹ️ 📤 producing 1000000 records to topic functions-messages
17:28:23 ℹ️ ✨ it will be done in batches of maximum 300000 records
17:28:23 ℹ️ ✨ setting --producer-property linger.ms=100 and --producer-property batch.size=500000
17:28:23 ℹ️ ⚙️ following producer properties will be used:  --producer-property linger.ms=1000 --producer-property batch.size=500000
17:28:23 ℹ️ 📤 producing a batch of 300000 records to topic functions-messages
17:28:23 ℹ️ 💯 0/1000000 records sent so far...
17:28:24 ℹ️ 📤 producing a batch of 300000 records to topic functions-messages
17:28:25 ℹ️ 💯 300000/1000000 records sent so far...
17:28:26 ℹ️ 📤 producing a batch of 300000 records to topic functions-messages
17:28:26 ℹ️ 💯 600000/1000000 records sent so far...
17:28:28 ℹ️ 📤 producing a batch of 100000 records to topic functions-messages
17:28:28 ℹ️ 💯 900000/1000000 records sent so far...
17:28:30 ℹ️ 📤 produced 1000000 records to topic functions-messages, took: 0min 7sec
17:28:31 ℹ️ 💯 Get number of records in topic functions-messages
3000000