VPS-wide optimisation session May 2026. TCP tuning: syn_backlog 4096, slow_start_after_idle=0, fin_timeout=15. HTTP/2 enabled all HTTPS sites. Bark server warmup disabled — swap dropped 91% to 37%. Freed 6GB: deleted orphaned suno cache + unused bark-small model. ARES cast endpoints pinned to Anthropic. SefirotCache, council_cache, Thamus cast responses all persist to SQLite. RSSAI archive WAL-enabled. Node heap caps on all services. nginx proxy cache zone for RSSAI endpoints.