Why is My Wordpress taking too much time to publish post.

Latency is an unavoidable aspect of computing, and the farther away you exist from your target endpoint, the more latency you will experience when you attempt to interact with it. Hosting your Linode in the US may be necessary if your target users are located near the Linode, but this will naturally increase your latency. Inversely, if you require faster responsiveness and don't care about end user experience, you could instead locate the server in Mumbai or Chennai.

In order to best determine your average speed/latency between yourself and any of our data centers, be sure to use our Speedtest Tool:

• Speed Tests | Cloud Infrastructure | Akamai

If you decide that you want to move your server, I would recommend cloning your existing Linode and then migrating it to a new Data Center. Be mindful that IP addresses are assigned to specific data centers, so you may need to update your DNS records if you deploy/migrate into a new region.