NATS Warning: Internal subscription on "$JS.API.CONSUMER.INFO.stream_name.consumer_name" took too long: 2.265209187s

Question

I have up to 10 subscribers who connect to the NATS server and continuously fetch the messages.The basic code which I use to subscribe the messages is:

IJetStreamPullSubscription sub = js.PullSubscribe(subject, pullOptions);

Some subscriber use this:

IList<Msg> list = sub.Fetch(100, 1000);

Some subscriber use this:

sub?.PullNoWait(100);
m = sub.NextMessage(1000);

The NATS server logs are generating warnings like:

[WRN] Internal subscription on "$JS.API.CONSUMER.INFO.org_log_stream.durable-Log" took too long: 2.265209187s
[WRN] 172.23.0.1:46074 - cid:494 - "v0.14.5.0:.NET" - Readloop processing time: 2.375663549s

I am trying to figure out these warnings. Please help me to understand the possible reasons.