I am currently hosting a test website under a 8 vcpu and 2gb ram virtual machine using nginx and php-fpm, the host machine is hosting other virtual machines doing the same thing with 10gbps network interface. During my stress test after 50 users requesting concurrently my test website's response time rises from 800-900ms on normal to around 2 seconds. After this test I tried to increase the virtual machine's ram to 6gb but there were no change in the response time at all. What could be causing this?
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