This is copy pasted from the #tuning channel of the autobrr discord
Tuning for 4.3.9-4.5.2 on 1gbps libtorrent 1.2
Speed
Unlimited on all, rate limit µTP and LAN
Connection
Peer connection protocol: TCP
Global max: off
Max num per torrent: off
Global max number upload slots: off
Max number of upload slots: off
Advanced
Interface: Bind your interface to prevent leaks
File Pool Size: 5000
Outstanding Mem: 128
Disk Cache: 1024 (or -1 if you feel ballsy, 0 if you experience memory leaks)
Disk cache expiry: 60
Disk IO Type: Default
Disk IO Read Mode: Enable OS Cache
Disk IO Write Mode: Enable OS Cache
Coalesce reads and writes: OFF
Use piece extent affinity: ON
Send Upload Piece Suggestions: ON
Send Buffer Watermark: 5120
Send Buffer Low Watermark: 512
Send buffer watermark factor: Between 200-250, adjust as needed
Outgoing connections per second: 50
Socket Backlog: 1000
Peer TOS: 128
utp-tcp mixed mode algo: Prefer TCP
Support IDN: ON
Allow Multiple Connections from the same IP address: ON
Validate HTTPS: OFF
SSRF Mitigation: ON
Upload Slots Behaviour: Fixed Slots
Upload choking alogrithm: Fastest Upload
Always announce to all tiers: ON
Max concurrent HTTP Announces: 50-75 (only increase if experiencing announce issues with very high amount of torrents loaded in client)
Peer turnover disconnect Percentage: 0
Peer turnover threshold percentage: 90
Peer turnover disconnect interval: 30
Max outstanding requests to a single peer: Leave as is
I personally left "Validate HTTPS" enabled since i haven't researched what security risks might come from disabling https
In the FAQ section of the linked rutracker page mentions AVX2 processor features which yours might not have and recommends to use an older release