Slow domoticz sensor display

[sazaki]

I am in the feasibility study of a project. I have some concerns about the response speed of domoticz. I tried the following:
- using domoticz API, I sent an http request to change the state(open/close) of a contact switch(virtual sensor). Domoticz displayed the new state of the switch around 8 sec later. For my project, I need 1~3 sec response time.
I have changed the value of RetryTimeout to 1 sec in options.xml, but the display refresh speed did not improve.
Any help or advice is appreciated.