October 6, 2026
Codex loads conversations faster: Charlie Marsh saw a speedup of about 80%
In an Oct 6 test, Codex displayed the conversation list about 80% faster after a change to how it handled I/O.
Charlie Marsh
@charliermarsh
I applied the rule "batch I/O operations into a single blocking Tokio task" to Codex and got huge speedups across several common workflows. For example, the conversation list now loads about 80% faster.
· 443 views
Charlie Marsh applied a rule to Codex: batch I/O operations into a single blocking Tokio task. Instead of separate tasks for reads and writes, he grouped the work into one.
Marsh also saw speedups across several other common workflows.