Does the delay occur in both rasa shell and rasa run?
Yes, in both! On the UI side it feels more than 2 sec. But the timestamp of rasa run shows the equal lag of 2 seconds, as in rasa shell.
@akelad Did you find any solution to this or any reason perhaps, as to why the call is getting delayed??
And btw the call is getting delayed only when action server is called from rasa, I tested calling action server from Postman and there wasnt any noticable lag.
Please reply! 
Run the following command to monitor the rest call to the action server. Iād like to know if the 2 second delay is before the rasa POST or after.
sudo tcpdump -A -t -s 0 'tcp port 5055 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)'
@stephens Hey Greg! Can you give me the command for Windows??
I was just wondering , the issue that i am suffering withā¦does it has anything to do with this???-
In my cmd, the debug shows-
2020-01-27 12:24:29 DEBUG rasa.core.processor - Logged UserUtterance - tracker now has 4 events.
4 events in tracker are created after first message sent by user. And
2020-01-27 12:32:46 DEBUG rasa.core.processor - Logged UserUtterance - tracker now has 13 events.
And 13 events in the tracker after the second message . Both the first and second messages are same.
The tracker would not have an effect on this issue. I canāt answer your question about tcpdump on Windows. You should google tcpdump for windows or tcp traffic monitoring.
Hi, did this issue get resolved ?
Iām currently facing the same problem. I run rasa 1.8 and the action server on the same machine, and Iām experiencing a 2 seconds delay even for a āhello worldā custom action on the default beginner bot.
When looking at the logs of the action server, it seems that it serves my request almost instantaneously, so the problem seems to be with the call
@vincenterb is this just running rasa shell?
Unfortunately no, I also tried using rasa run and using an agent in a python script but the problem still occurs.
what do you mean? Iām asking if youāre encountering this experience with rasa shell?
Iām encountering this experience with rasa shell, but Iām also experiencing it with rasa run or the agent
Could you show me the logs of both the shell and the action server?
Hello, Iāve found that changing the action server endpoints from http://localhost:5055/webhook to http://127.0.0.1:5055/webhook makes the delay disappear on Windows machine, as mentioned in this thread
Thank you very much this solved my issue, my requests went from 2 seconds to 15 ms now.
@tomgun132, nice fix!
It seems to be that the cause of this issue is IPv4 vs IPv6, as explained in this related stackoverflow solution on resolution of localhost by the DNS on Windows.
Your fix is one of the recommended ways to solve this issue.