Limit the rate of DNS queries

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Suggestion

When qBittorrent starts and loads a large number of torrents, it will generate a large number of DNS queries very quickly (thousands per second). Some DNS servers (e.g. Pi-hole) have a rate limiting feature, and may start to throttle the computer's DNS queries (refuse to answer) as a result. In one case this resulted in 45 minutes of no DNS queries answered.
It would be nice if there was a possibility to limit the rate of DNS queries. This could be implemented with a queue, where a thread would retrieve queries at a set rate from the queue and send them out to the DNS server. This could result in delaying the start of downloading and seeding, because until a tracker's DNS name is resolved, it can't be contacted.

Use case

Limit the rate of DNS queries (especially at startup) to avoid triggering DNS servers with rate limit enforcement.

Extra info/examples/attachments

Pi-hole rate limit documentation

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