Airbyte Kafka source sync is taking longer time for Avro type message

I have Airbyte with Kafka as source and Snowflake is destination. My Kafka message is in Avro format. But sync performance is very slow. Even for 40k messages it took 1hour. Should I add any special settings or schema registry for Avro type kafka records?
My config json starts as follows:
“streams”: [
“stream”: {
“name”: “abc”,
“type” : “object”,
“$schema” : “