FeatureArchitecture

Event-driven by design.

Process-based servers dedicate a process or thread to each connection. LiteSpeed handles thousands of connections in a handful of processes, so memory stays flat as traffic grows.

Comparison

Two Ways To Serve Traffic

Event-driven (LiteSpeed)Process-based (Apache prefork)
Connections per processThousandsOne
Memory as traffic growsNearly flatGrows with every connection
Context switchingMinimalHeavy under load
Slow clientsHandled without blockingTie up a worker each
Traffic spikesAbsorbed gracefullyCan exhaust workers and swap
In practice

What It Means For Your Servers

  • More sites per server without upgrading hardware
  • Stable response times during traffic spikes
  • Lower memory usage leaves more room for PHP and databases
  • Keep-alive connections cost almost nothing
1
Process for thousands of connections
Flat
Memory curve under load
0
Blocked workers from slow clients
↑
Sites per server
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