Derek Collison 087a28a13e When creating replicated mirrors where the source stream had a very large starting sequence number, the server would use excessive CPU and Memory.
This is due to the mirroring functionality trying to skip messages when it detects a gap. In a replicated stream this puts excessive stress on the raft system.
This step is not needed at all if the mirror stream has no messages, we can simply jump ahead.

Signed-off-by: Derek Collison <derek@nats.io>
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NATS is a simple, secure and performant communications system for digital systems, services and devices. NATS is part of the Cloud Native Computing Foundation (CNCF). NATS has over 40 client language implementations, and its server can run on-premise, in the cloud, at the edge, and even on a Raspberry Pi. NATS can secure and simplify design and operation of modern distributed systems.

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