> I copied the CentOS 5 /etc/X11/xorg.conf to CentOS 7 (on the same > computer) and rebooted - no effect. I copied the CentOS 7 > /etc/X11/xorg.conf.d/00-keyboard.conf to CentOS 5 and rebooted - no > effect. I tried different CentOS 5 xset settings, I tried an IBM Soft > Touch and a Logitech keyboard using different cabeling. What might > resolve this new one second delay for each CentOS 5 keyboard key? What > might have caused it? Did you change or update any hardware recently? This might be a bit far-fetched, but I observed behaviour like this when connecting a new monitor to a machine running CentOS5 through DVI. I don't recall the details, but the monitor created some kind of interrupt issue that the CentOS5 kernel (5.4 - 2.6.18-164.15.1.el5) couldn't handle. Symptoms were slow-responding keyboard and jerky mouse. If it's something like this, you should see it in the logs.