net.server_epoll: Set minimum wait time to 1ms, matching epoll A timeout value less than 0.001 gets turned into zero on the C side, so epoll_wait() returns instantly and essentially busy-loops up to 1ms, e.g. when a timer event ends up scheduled (0, 0.001)ms into the future. Unsure if this has much effect in practice, but it may waste a small amount of CPU time. How much would depend on how often this ends up happening and how fast the CPU gets trough main loop iterations.

--- a/net/server_epoll.lua	Thu Jul 15 00:38:27 2021 +0200
+++ b/net/server_epoll.lua	Thu Jul 15 01:38:44 2021 +0200
@@ -65,7 +65,7 @@
 
 	-- Maximum and minimum amount of time to sleep waiting for events (adjusted for pending timers)
 	max_wait = 86400;
-	min_wait = 1e-06;
+	min_wait = 0.001;
 
 	-- Enable extra noisy debug logging
 	-- TODO disable once considered stable