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Server Response Time slow and differs
I am using 1 GB Memory / 25 GB Disk / NYC3 - Ubuntu 18.04.3 (LTS) x64
In general, for approximately 100 kb static file download, server responds within second but today I have realized sometimes it takes more than 10 - 20 seconds.
Why does this fluctuate ? CPu usage is always constant and around %5, bandwidth usage is around 100 kb/s
What do you suggest for making more stable server and reduce the respond time ? Where should I start to examine this issue ?
backend: node.js, nginx