tmux 2.x performance regression when switching windows

Patrick Mézard
Sun May 24 15:02:00 GMT 2015


I noticed moving between tmux windows became much slower since 2.0.x when running some applications in the windows. The problems disappear if I move back to 1.9. To reproduce:
- Cygwin: CYGWIN_NT-6.1-WOW PMD 2.0.2(0.287/5/3) 2015-05-08 17:03 i686 Cygwin, Win7 64 bits.
- Start tmux and create two windows.
- In one of the windows, execute the following Go program (natively compiled, Go 1.4.2 64-bits):
package main

import (

func main() {
    for i := 0; ; i++ {
- Try switching between windows
KO => it eventually succeeds but lags a lot. With 1.9, the switch is immediate.

Patrick Mézard

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